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4x-40=2x+12
We move all terms to the left:
4x-40-(2x+12)=0
We get rid of parentheses
4x-2x-12-40=0
We add all the numbers together, and all the variables
2x-52=0
We move all terms containing x to the left, all other terms to the right
2x=52
x=52/2
x=26
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