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(x-23)+(x+65)=180
We move all terms to the left:
(x-23)+(x+65)-(180)=0
We get rid of parentheses
x+x-23+65-180=0
We add all the numbers together, and all the variables
2x-138=0
We move all terms containing x to the left, all other terms to the right
2x=138
x=138/2
x=69
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