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(2x+30)+40=180
We move all terms to the left:
(2x+30)+40-(180)=0
We add all the numbers together, and all the variables
(2x+30)-140=0
We get rid of parentheses
2x+30-140=0
We add all the numbers together, and all the variables
2x-110=0
We move all terms containing x to the left, all other terms to the right
2x=110
x=110/2
x=55
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