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4x-12=2x+3+1x
We move all terms to the left:
4x-12-(2x+3+1x)=0
We add all the numbers together, and all the variables
4x-(3x+3)-12=0
We get rid of parentheses
4x-3x-3-12=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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