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+1500=S+90
We move all terms to the left:
+1500-(S+90)=0
We get rid of parentheses
-S-90+1500=0
We add all the numbers together, and all the variables
-1S+1410=0
We move all terms containing S to the left, all other terms to the right
-S=-1410
S=-1410/-1
S=+1410
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