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9=3x+9-15x
We move all terms to the left:
9-(3x+9-15x)=0
We add all the numbers together, and all the variables
-(-12x+9)+9=0
We get rid of parentheses
12x-9+9=0
We add all the numbers together, and all the variables
12x=0
x=0/12
x=0
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