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8x+4=12x+20
We move all terms to the left:
8x+4-(12x+20)=0
We get rid of parentheses
8x-12x-20+4=0
We add all the numbers together, and all the variables
-4x-16=0
We move all terms containing x to the left, all other terms to the right
-4x=16
x=16/-4
x=-4
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