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(x+30)+(2x+90)+(4x+30)=360
We move all terms to the left:
(x+30)+(2x+90)+(4x+30)-(360)=0
We get rid of parentheses
x+2x+4x+30+90+30-360=0
We add all the numbers together, and all the variables
7x-210=0
We move all terms containing x to the left, all other terms to the right
7x=210
x=210/7
x=30
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