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 add all the numbers together, and all the variables

2s-((-1s)+21)-54=0



We calculate terms in parentheses: -((-1s)+21), so:

(-1s)+21

We get rid of parentheses

-1s+21

Back to the equation:

-(-1s+21)



We get rid of parentheses

2s+1s-21-54=0

We add all the numbers together, and all the variables

3s-75=0

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

3s=75

s=75/3

s=25

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