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(x+50)+(4x+100)+(2x+130)=360
We move all terms to the left:
(x+50)+(4x+100)+(2x+130)-(360)=0
We get rid of parentheses
x+4x+2x+50+100+130-360=0
We add all the numbers together, and all the variables
7x-80=0
We move all terms containing x to the left, all other terms to the right
7x=80
x=80/7
x=11+3/7
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