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(13+x)*12=180
We move all terms to the left:
(13+x)*12-(180)=0
We add all the numbers together, and all the variables
(x+13)*12-180=0
We multiply parentheses
12x+156-180=0
We add all the numbers together, and all the variables
12x-24=0
We move all terms containing x to the left, all other terms to the right
12x=24
x=24/12
x=2
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