89=21+4k

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Solution for 89=21+4k equation: 



89=21+4k

We move all terms to the left:

89-(21+4k)=0

We add all the numbers together, and all the variables

-(4k+21)+89=0

We get rid of parentheses

-4k-21+89=0

We add all the numbers together, and all the variables

-4k+68=0

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

-4k=-68

k=-68/-4

k=+17

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