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13=4+3s
We move all terms to the left:
13-(4+3s)=0
We add all the numbers together, and all the variables
-(3s+4)+13=0
We get rid of parentheses
-3s-4+13=0
We add all the numbers together, and all the variables
-3s+9=0
We move all terms containing s to the left, all other terms to the right
-3s=-9
s=-9/-3
s=+3
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