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-7=-4+s
We move all terms to the left:
-7-(-4+s)=0
We add all the numbers together, and all the variables
-(s-4)-7=0
We get rid of parentheses
-s+4-7=0
We add all the numbers together, and all the variables
-1s-3=0
We move all terms containing s to the left, all other terms to the right
-s=3
s=3/-1
s=-3
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