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-18=-4+2S
We move all terms to the left:
-18-(-4+2S)=0
We add all the numbers together, and all the variables
-(2S-4)-18=0
We get rid of parentheses
-2S+4-18=0
We add all the numbers together, and all the variables
-2S-14=0
We move all terms containing S to the left, all other terms to the right
-2S=14
S=14/-2
S=-7
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