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-13=-2s+-7
We move all terms to the left:
-13-(-2s+-7)=0
We add all the numbers together, and all the variables
-(-2s-7)-13=0
We get rid of parentheses
2s+7-13=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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