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x=15x+12=9x+20
We move all terms to the left:
x-(15x+12)=0
We get rid of parentheses
x-15x-12=0
We add all the numbers together, and all the variables
-14x-12=0
We move all terms containing x to the left, all other terms to the right
-14x=12
x=12/-14
x=-6/7
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