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4x-72=6x-84
We move all terms to the left:
4x-72-(6x-84)=0
We get rid of parentheses
4x-6x+84-72=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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