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720=X+80+135+130+115+X+50+X+75
We move all terms to the left:
720-(X+80+135+130+115+X+50+X+75)=0
We add all the numbers together, and all the variables
-(3X+585)+720=0
We get rid of parentheses
-3X-585+720=0
We add all the numbers together, and all the variables
-3X+135=0
We move all terms containing X to the left, all other terms to the right
-3X=-135
X=-135/-3
X=+45
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