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6x-12=9x+20
We move all terms to the left:
6x-12-(9x+20)=0
We get rid of parentheses
6x-9x-20-12=0
We add all the numbers together, and all the variables
-3x-32=0
We move all terms containing x to the left, all other terms to the right
-3x=32
x=32/-3
x=-10+2/3
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