2s-54=s+21

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Solution for 2s-54=s+21 equation: 



2s-54=s+21

We move all terms to the left:

2s-54-(s+21)=0

We get rid of parentheses

2s-s-21-54=0

We add all the numbers together, and all the variables

s-75=0

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

s=75

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