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3x+3=9x-3
We move all terms to the left:
3x+3-(9x-3)=0
We get rid of parentheses
3x-9x+3+3=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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