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^2=25S-150=0
We move all terms to the left:
^2-(25S-150)=0
We add all the numbers together, and all the variables
-(25S-150)=0
We get rid of parentheses
-25S+150=0
We move all terms containing S to the left, all other terms to the right
-25S=-150
S=-150/-25
S=+6
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