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Question Number 132597 by Study last updated on 15/Feb/21

Commented by mr W last updated on 15/Feb/21

$$\frac{156}{x+7}=\frac{156}{x}-14$$$$156x=156(x+7)-14x(x+7)$$$$x^2+7x-78=0$$$$(x-6)(x+13)=0$$$$x=6,-13\left(rejected\right)$$$$heexpectedtodothejobin6hours.$$

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