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10-7s+7=-7-s
We move all terms to the left:
10-7s+7-(-7-s)=0
We add all the numbers together, and all the variables
-7s-(-1s-7)+10+7=0
We add all the numbers together, and all the variables
-7s-(-1s-7)+17=0
We get rid of parentheses
-7s+1s+7+17=0
We add all the numbers together, and all the variables
-6s+24=0
We move all terms containing s to the left, all other terms to the right
-6s=-24
s=-24/-6
s=+4
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