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12x-40=-4x
We move all terms to the left:
12x-40-(-4x)=0
We get rid of parentheses
12x+4x-40=0
We add all the numbers together, and all the variables
16x-40=0
We move all terms containing x to the left, all other terms to the right
16x=40
x=40/16
x=2+1/2
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