-89=-9+4k

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Solution for -89=-9+4k equation: 



-89=-9+4k

We move all terms to the left:

-89-(-9+4k)=0

We add all the numbers together, and all the variables

-(4k-9)-89=0

We get rid of parentheses

-4k+9-89=0

We add all the numbers together, and all the variables

-4k-80=0

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

-4k=80

k=80/-4

k=-20

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