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15x-9=6x+6
We move all terms to the left:
15x-9-(6x+6)=0
We get rid of parentheses
15x-6x-6-9=0
We add all the numbers together, and all the variables
9x-15=0
We move all terms containing x to the left, all other terms to the right
9x=15
x=15/9
x=1+2/3
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