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15+12x=20x+6
We move all terms to the left:
15+12x-(20x+6)=0
We get rid of parentheses
12x-20x-6+15=0
We add all the numbers together, and all the variables
-8x+9=0
We move all terms containing x to the left, all other terms to the right
-8x=-9
x=-9/-8
x=1+1/8
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