51=21+6k

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Solution for 51=21+6k equation: 



51=21+6k

We move all terms to the left:

51-(21+6k)=0

We add all the numbers together, and all the variables

-(6k+21)+51=0

We get rid of parentheses

-6k-21+51=0

We add all the numbers together, and all the variables

-6k+30=0

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

-6k=-30

k=-30/-6

k=+5

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