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8x-12+x+20=3x+4
We move all terms to the left:
8x-12+x+20-(3x+4)=0
We add all the numbers together, and all the variables
9x-(3x+4)+8=0
We get rid of parentheses
9x-3x-4+8=0
We add all the numbers together, and all the variables
6x+4=0
We move all terms containing x to the left, all other terms to the right
6x=-4
x=-4/6
x=-2/3
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