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40+(2x+30)=180
We move all terms to the left:
40+(2x+30)-(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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