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7s+8=-2+5s
We move all terms to the left:
7s+8-(-2+5s)=0
We add all the numbers together, and all the variables
7s-(5s-2)+8=0
We get rid of parentheses
7s-5s+2+8=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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