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7=-21+s
We move all terms to the left:
7-(-21+s)=0
We add all the numbers together, and all the variables
-(s-21)+7=0
We get rid of parentheses
-s+21+7=0
We add all the numbers together, and all the variables
-1s+28=0
We move all terms containing s to the left, all other terms to the right
-s=-28
s=-28/-1
s=+28
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