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100+30+(x-20)=180
We move all terms to the left:
100+30+(x-20)-(180)=0
We add all the numbers together, and all the variables
(x-20)-50=0
We get rid of parentheses
x-20-50=0
We add all the numbers together, and all the variables
x-70=0
We move all terms containing x to the left, all other terms to the right
x=70
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