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7x-72=4x-12
We move all terms to the left:
7x-72-(4x-12)=0
We get rid of parentheses
7x-4x+12-72=0
We add all the numbers together, and all the variables
3x-60=0
We move all terms containing x to the left, all other terms to the right
3x=60
x=60/3
x=20
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