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6x-8=12x+40
We move all terms to the left:
6x-8-(12x+40)=0
We get rid of parentheses
6x-12x-40-8=0
We add all the numbers together, and all the variables
-6x-48=0
We move all terms containing x to the left, all other terms to the right
-6x=48
x=48/-6
x=-8
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