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(X+10)+120+X+120+100=720
We move all terms to the left:
(X+10)+120+X+120+100-(720)=0
We add all the numbers together, and all the variables
X+(X+10)-380=0
We get rid of parentheses
X+X+10-380=0
We add all the numbers together, and all the variables
2X-370=0
We move all terms containing X to the left, all other terms to the right
2X=370
X=370/2
X=185
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