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(x+40)+x+30=180
We move all terms to the left:
(x+40)+x+30-(180)=0
We add all the numbers together, and all the variables
x+(x+40)-150=0
We get rid of parentheses
x+x+40-150=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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