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-3x+12=2x-8
We move all terms to the left:
-3x+12-(2x-8)=0
We get rid of parentheses
-3x-2x+8+12=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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