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x+12=156-x
We move all terms to the left:
x+12-(156-x)=0
We add all the numbers together, and all the variables
x-(-1x+156)+12=0
We get rid of parentheses
x+1x-156+12=0
We add all the numbers together, and all the variables
2x-144=0
We move all terms containing x to the left, all other terms to the right
2x=144
x=144/2
x=72
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