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