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8x+12=4x.
We move all terms to the left:
8x+12-(4x.)=0
We add all the numbers together, and all the variables
8x-(+4x.)+12=0
We get rid of parentheses
8x-4x.+12=0
We move all terms containing x to the left, all other terms to the right
8x-4x.=-12
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