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Question

By what number should (−6)−1 be multiplied so that the product becomes 9−1?

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Solution

Let the required number be x.

x×(-6)-1=9-1

x×1-6=19x-6=19or x=-69
The greatest common divisor for the numerator and the denominator is 3.

x=-69=(-6)÷39÷3=-23

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