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+0=43-S
We move all terms to the left:
+0-(43-S)=0
We add all the numbers together, and all the variables
-(-1S+43)+0=0
We add all the numbers together, and all the variables
-(-1S+43)=0
We get rid of parentheses
1S-43=0
We add all the numbers together, and all the variables
S-43=0
We move all terms containing S to the left, all other terms to the right
S=43
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