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x-12=-7x+28
We move all terms to the left:
x-12-(-7x+28)=0
We get rid of parentheses
x+7x-28-12=0
We add all the numbers together, and all the variables
8x-40=0
We move all terms containing x to the left, all other terms to the right
8x=40
x=40/8
x=5
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