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9x-12=-6x
We move all terms to the left:
9x-12-(-6x)=0
We get rid of parentheses
9x+6x-12=0
We add all the numbers together, and all the variables
15x-12=0
We move all terms containing x to the left, all other terms to the right
15x=12
x=12/15
x=4/5
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