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(x+12)+x=172
We move all terms to the left:
(x+12)+x-(172)=0
We add all the numbers together, and all the variables
x+(x+12)-172=0
We get rid of parentheses
x+x+12-172=0
We add all the numbers together, and all the variables
2x-160=0
We move all terms containing x to the left, all other terms to the right
2x=160
x=160/2
x=80
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