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(10x+20)+40=180
We move all terms to the left:
(10x+20)+40-(180)=0
We add all the numbers together, and all the variables
(10x+20)-140=0
We get rid of parentheses
10x+20-140=0
We add all the numbers together, and all the variables
10x-120=0
We move all terms containing x to the left, all other terms to the right
10x=120
x=120/10
x=12
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