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