-90=-k-9

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Solution for -90=-k-9 equation: 



-90=-k-9

We move all terms to the left:

-90-(-k-9)=0

We add all the numbers together, and all the variables

-(-1k-9)-90=0

We get rid of parentheses

1k+9-90=0

We add all the numbers together, and all the variables

k-81=0

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

k=81

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