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8x+6(-2x)=12
We move all terms to the left:
8x+6(-2x)-(12)=0
We multiply parentheses
8x-12x-12=0
We add all the numbers together, and all the variables
-4x-12=0
We move all terms containing x to the left, all other terms to the right
-4x=12
x=12/-4
x=-3
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