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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+28=0
We move all terms containing x to the left, all other terms to the right
2x=-28
x=-28/2
x=-14
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