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(3x+40)+(x+90)=180
We move all terms to the left:
(3x+40)+(x+90)-(180)=0
We get rid of parentheses
3x+x+40+90-180=0
We add all the numbers together, and all the variables
4x-50=0
We move all terms containing x to the left, all other terms to the right
4x=50
x=50/4
x=12+1/2
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