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72=4x+12
We move all terms to the left:
72-(4x+12)=0
We get rid of parentheses
-4x-12+72=0
We add all the numbers together, and all the variables
-4x+60=0
We move all terms containing x to the left, all other terms to the right
-4x=-60
x=-60/-4
x=+15
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