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If 2x - 3y = 7 and (a+b)x- (a+b-3)y = 4...

If `2x - 3y = 7` and `(a+b)x- (a+b-3)y = 4a + b` represent coincident lines, then a and b satisfy the equation ?

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The correct Answer is:
` a = - 5, b = - 1 `
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