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(2x+91)+(4x+31)=180
We move all terms to the left:
(2x+91)+(4x+31)-(180)=0
We get rid of parentheses
2x+4x+91+31-180=0
We add all the numbers together, and all the variables
6x-58=0
We move all terms containing x to the left, all other terms to the right
6x=58
x=58/6
x=9+2/3
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