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(72x-84)-84=-12-84
We move all terms to the left:
(72x-84)-84-(-12-84)=0
We add all the numbers together, and all the variables
(72x-84)-84-(-96)=0
We add all the numbers together, and all the variables
(72x-84)+12=0
We get rid of parentheses
72x-84+12=0
We add all the numbers together, and all the variables
72x-72=0
We move all terms containing x to the left, all other terms to the right
72x=72
x=72/72
x=1
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