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(x+10)+(x+40)+50=180
We move all terms to the left:
(x+10)+(x+40)+50-(180)=0
We add all the numbers together, and all the variables
(x+10)+(x+40)-130=0
We get rid of parentheses
x+x+10+40-130=0
We add all the numbers together, and all the variables
2x-80=0
We move all terms containing x to the left, all other terms to the right
2x=80
x=80/2
x=40
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