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4x-40=x+12
We move all terms to the left:
4x-40-(x+12)=0
We get rid of parentheses
4x-x-12-40=0
We add all the numbers together, and all the variables
3x-52=0
We move all terms containing x to the left, all other terms to the right
3x=52
x=52/3
x=17+1/3
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