51=3s+21

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Solution for 51=3s+21 equation: 



51=3s+21

We move all terms to the left:

51-(3s+21)=0

We get rid of parentheses

-3s-21+51=0

We add all the numbers together, and all the variables

-3s+30=0

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

-3s=-30

s=-30/-3

s=+10

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