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12=72+5x
We move all terms to the left:
12-(72+5x)=0
We add all the numbers together, and all the variables
-(5x+72)+12=0
We get rid of parentheses
-5x-72+12=0
We add all the numbers together, and all the variables
-5x-60=0
We move all terms containing x to the left, all other terms to the right
-5x=60
x=60/-5
x=-12
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