9-9k=-90

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Solution for 9-9k=-90 equation: 



9-9k=-90

We move all terms to the left:

9-9k-(-90)=0

We add all the numbers together, and all the variables

-9k+99=0

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

-9k=-99

k=-99/-9

k=+11

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