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(2x+20)+(x-10)=360
We move all terms to the left:
(2x+20)+(x-10)-(360)=0
We get rid of parentheses
2x+x+20-10-360=0
We add all the numbers together, and all the variables
3x-350=0
We move all terms containing x to the left, all other terms to the right
3x=350
x=350/3
x=116+2/3
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