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-12=-2x-28
We move all terms to the left:
-12-(-2x-28)=0
We get rid of parentheses
2x+28-12=0
We add all the numbers together, and all the variables
2x+16=0
We move all terms containing x to the left, all other terms to the right
2x=-16
x=-16/2
x=-8
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