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(x-40)+(1+2x)=180
We move all terms to the left:
(x-40)+(1+2x)-(180)=0
We add all the numbers together, and all the variables
(x-40)+(2x+1)-180=0
We get rid of parentheses
x+2x-40+1-180=0
We add all the numbers together, and all the variables
3x-219=0
We move all terms containing x to the left, all other terms to the right
3x=219
x=219/3
x=73
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