9k-9=-90

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Solution for 9k-9=-90 equation: 



9k-9=-90

We move all terms to the left:

9k-9-(-90)=0

We add all the numbers together, and all the variables

9k+81=0

We move all terms containing k to the left, all other terms to the right

9k=-81

k=-81/9

k=-9

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