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Consider the family of lines 5x+3y-2 +...

Consider the family of lines ` 5x+3y-2 + lambda (3x-y-4)=0` and `x-y+1 + mu (2x - y - 2) = 0 ` Equation of straight line that belong to both families is `ax+by-7=0` then `a+b` is

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