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3x+6x=3x(1+2)
We move all terms to the left:
3x+6x-(3x(1+2))=0
We add all the numbers together, and all the variables
3x+6x-(3x3)=0
We add all the numbers together, and all the variables
-3x^3+9x=0
We do not support expression: x^3
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