(s+1)+(2s-1)=90

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Solution for (s+1)+(2s-1)=90 equation: 



(s+1)+(2s-1)=90

We move all terms to the left:

(s+1)+(2s-1)-(90)=0

We get rid of parentheses

s+2s+1-1-90=0

We add all the numbers together, and all the variables

3s-90=0

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

3s=90

s=90/3

s=30

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