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(x+10)+x+120+120+100=720
We move all terms to the left:
(x+10)+x+120+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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