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12x-40=18x-76
We move all terms to the left:
12x-40-(18x-76)=0
We get rid of parentheses
12x-18x+76-40=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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