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k\times 9=\left(k-7\right)\times 6
Variable k cannot be equal to any of the values 0,7 since division by zero is not defined. Multiply both sides of the equation by k\left(k-7\right), the least common multiple of k-7,k.
k\times 9=6k-42
Use the distributive property to multiply k-7 by 6.
k\times 9-6k=-42
Subtract 6k from both sides.
3k=-42
Combine k\times 9 and -6k to get 3k.
k=\frac{-42}{3}
Divide both sides by 3.
k=-14
Divide -42 by 3 to get -14.