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12x-4=6x-40
We move all terms to the left:
12x-4-(6x-40)=0
We get rid of parentheses
12x-6x+40-4=0
We add all the numbers together, and all the variables
6x+36=0
We move all terms containing x to the left, all other terms to the right
6x=-36
x=-36/6
x=-6
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