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15=5+2s
We move all terms to the left:
15-(5+2s)=0
We add all the numbers together, and all the variables
-(2s+5)+15=0
We get rid of parentheses
-2s-5+15=0
We add all the numbers together, and all the variables
-2s+10=0
We move all terms containing s to the left, all other terms to the right
-2s=-10
s=-10/-2
s=+5
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