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12+12x-4x=28+4x
We move all terms to the left:
12+12x-4x-(28+4x)=0
We add all the numbers together, and all the variables
12x-4x-(4x+28)+12=0
We add all the numbers together, and all the variables
8x-(4x+28)+12=0
We get rid of parentheses
8x-4x-28+12=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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