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