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8-4x=3x+12
We move all terms to the left:
8-4x-(3x+12)=0
We get rid of parentheses
-4x-3x-12+8=0
We add all the numbers together, and all the variables
-7x-4=0
We move all terms containing x to the left, all other terms to the right
-7x=4
x=4/-7
x=-4/7
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