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3x+20=12x-8
We move all terms to the left:
3x+20-(12x-8)=0
We get rid of parentheses
3x-12x+8+20=0
We add all the numbers together, and all the variables
-9x+28=0
We move all terms containing x to the left, all other terms to the right
-9x=-28
x=-28/-9
x=3+1/9
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