20.5=9.5+3.5s-31.5

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Solution for 20.5=9.5+3.5s-31.5 equation: 



20.5=9.5+3.5s-31.5

We move all terms to the left:

20.5-(9.5+3.5s-31.5)=0

We add all the numbers together, and all the variables

-(3.5s-22)+20.5=0

We get rid of parentheses

-3.5s+22+20.5=0

We add all the numbers together, and all the variables

-3.5s+42.5=0

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

-3.5s=-42.5

s=-42.5/-3.5

s=12+0.5/3.5

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