7=s+15

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Solution for 7=s+15 equation: 



7=s+15

We move all terms to the left:

7-(s+15)=0

We get rid of parentheses

-s-15+7=0

We add all the numbers together, and all the variables

-1s-8=0

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

-s=8

s=8/-1

s=-8

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