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x=3x+3x-9
We move all terms to the left:
x-(3x+3x-9)=0
We add all the numbers together, and all the variables
x-(6x-9)=0
We get rid of parentheses
x-6x+9=0
We add all the numbers together, and all the variables
-5x+9=0
We move all terms containing x to the left, all other terms to the right
-5x=-9
x=-9/-5
x=1+4/5
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