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(x+20)+5x+40=180
We move all terms to the left:
(x+20)+5x+40-(180)=0
We add all the numbers together, and all the variables
5x+(x+20)-140=0
We get rid of parentheses
5x+x+20-140=0
We add all the numbers together, and all the variables
6x-120=0
We move all terms containing x to the left, all other terms to the right
6x=120
x=120/6
x=20
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