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12+4x=18+2x
We move all terms to the left:
12+4x-(18+2x)=0
We add all the numbers together, and all the variables
4x-(2x+18)+12=0
We get rid of parentheses
4x-2x-18+12=0
We add all the numbers together, and all the variables
2x-6=0
We move all terms containing x to the left, all other terms to the right
2x=6
x=6/2
x=3
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