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Solve the equations and check your answer in the case:
`(3)/(4)(2x-5)-(5)/(6)(7-5x)=(7x)/(3)`

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To solve the equation \( \frac{3}{4}(2x-5) - \frac{5}{6}(7-5x) = \frac{7x}{3} \), we will follow these steps: ### Step 1: Distribute the fractions Distributing the fractions on the left side of the equation gives us: \[ \frac{3}{4} \cdot 2x - \frac{3}{4} \cdot 5 - \frac{5}{6} \cdot 7 + \frac{5}{6} \cdot 5x = \frac{7x}{3} \] This simplifies to: \[ \frac{3 \cdot 2x}{4} - \frac{15}{4} - \frac{35}{6} + \frac{25x}{6} = \frac{7x}{3} \] ### Step 2: Simplify the fractions Calculating the coefficients: \[ \frac{3 \cdot 2x}{4} = \frac{6x}{4} = \frac{3x}{2} \] Now, we have: \[ \frac{3x}{2} - \frac{15}{4} - \frac{35}{6} + \frac{25x}{6} = \frac{7x}{3} \] ### Step 3: Combine like terms To combine the \(x\) terms, we need a common denominator. The least common multiple of 2 and 6 is 6. Rewriting: \[ \frac{3x}{2} = \frac{9x}{6} \] Now, substituting back into the equation: \[ \frac{9x}{6} + \frac{25x}{6} - \frac{15}{4} - \frac{35}{6} = \frac{7x}{3} \] Combining the \(x\) terms: \[ \frac{34x}{6} - \frac{15}{4} - \frac{35}{6} = \frac{7x}{3} \] ### Step 4: Move all \(x\) terms to one side Now, let's move all \(x\) terms to one side: \[ \frac{34x}{6} - \frac{7x}{3} = \frac{15}{4} + \frac{35}{6} \] ### Step 5: Find a common denominator for the fractions The least common multiple of 6 and 3 is 6. Rewriting: \[ \frac{7x}{3} = \frac{14x}{6} \] Now, we have: \[ \frac{34x}{6} - \frac{14x}{6} = \frac{15}{4} + \frac{35}{6} \] This simplifies to: \[ \frac{20x}{6} = \frac{15}{4} + \frac{35}{6} \] ### Step 6: Combine the constants on the right side Finding a common denominator for \( \frac{15}{4} \) and \( \frac{35}{6} \): The least common multiple of 4 and 6 is 12. Rewriting: \[ \frac{15}{4} = \frac{45}{12}, \quad \frac{35}{6} = \frac{70}{12} \] Now, we have: \[ \frac{20x}{6} = \frac{45}{12} + \frac{70}{12} = \frac{115}{12} \] ### Step 7: Solve for \(x\) Cross-multiplying gives: \[ 20x \cdot 12 = 115 \cdot 6 \] This simplifies to: \[ 240x = 690 \] Dividing both sides by 240: \[ x = \frac{690}{240} = \frac{115}{40} = \frac{23}{8} \] ### Step 8: Final simplification The value of \(x\) simplifies to: \[ x = \frac{23}{40} \] ### Step 9: Check the solution To check, substitute \(x = \frac{23}{40}\) back into the original equation and verify both sides are equal.
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ICSE-LINEAR EQUATIONS-EXERCISE 14A
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