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(91)+(x+31)=180
We move all terms to the left:
(91)+(x+31)-(180)=0
We add all the numbers together, and all the variables
(x+31)-89=0
We get rid of parentheses
x+31-89=0
We add all the numbers together, and all the variables
x-58=0
We move all terms containing x to the left, all other terms to the right
x=58
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