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4x+12=-4(3x)
We move all terms to the left:
4x+12-(-4(3x))=0
We get rid of parentheses
4x+43x+12=0
We add all the numbers together, and all the variables
47x+12=0
We move all terms containing x to the left, all other terms to the right
47x=-12
x=-12/47
x=-12/47
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