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(2x-45)+x=111
We move all terms to the left:
(2x-45)+x-(111)=0
We add all the numbers together, and all the variables
x+(2x-45)-111=0
We get rid of parentheses
x+2x-45-111=0
We add all the numbers together, and all the variables
3x-156=0
We move all terms containing x to the left, all other terms to the right
3x=156
x=156/3
x=52
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