90=s+s+s+s+2s

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Solution for 90=s+s+s+s+2s equation: 



90=s+s+s+s+2s

We move all terms to the left:

90-(s+s+s+s+2s)=0

We add all the numbers together, and all the variables

-(+6s)+90=0

We get rid of parentheses

-6s+90=0

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

-6s=-90

s=-90/-6

s=+15

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