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(x+20)+75+50=180
We move all terms to the left:
(x+20)+75+50-(180)=0
We add all the numbers together, and all the variables
(x+20)-55=0
We get rid of parentheses
x+20-55=0
We add all the numbers together, and all the variables
x-35=0
We move all terms containing x to the left, all other terms to the right
x=35
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