-20s-13s+-3s-(-s)+7s+8=-20

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Solution for -20s-13s+-3s-(-s)+7s+8=-20 equation: 



-20s-13s+-3s-(-s)+7s+8=-20

We move all terms to the left:

-20s-13s+-3s-(-s)+7s+8-(-20)=0

We add all the numbers together, and all the variables

-20s-13s-3s-(-1s)+7s+8+-(-20)=0

We add all the numbers together, and all the variables

-29s-(-1s)+28=0

We get rid of parentheses

-29s+1s+28=0

We add all the numbers together, and all the variables

-28s+28=0

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

-28s=-28

s=-28/-28

s=1

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