7=13-2s

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Solution for 7=13-2s equation: 



7=13-2s

We move all terms to the left:

7-(13-2s)=0

We add all the numbers together, and all the variables

-(-2s+13)+7=0

We get rid of parentheses

2s-13+7=0

We add all the numbers together, and all the variables

2s-6=0

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

2s=6

s=6/2

s=3

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