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(2x-20)+(2x+10)+x+2x+(x+30)=540
We move all terms to the left:
(2x-20)+(2x+10)+x+2x+(x+30)-(540)=0
We add all the numbers together, and all the variables
3x+(2x-20)+(2x+10)+(x+30)-540=0
We get rid of parentheses
3x+2x+2x+x-20+10+30-540=0
We add all the numbers together, and all the variables
8x-520=0
We move all terms containing x to the left, all other terms to the right
8x=520
x=520/8
x=65
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