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1/3x(3x+9)=12
We move all terms to the left:
1/3x(3x+9)-(12)=0
Domain of the equation: 3x(3x+9)!=0We multiply all the terms by the denominator
x∈R
-12*3x(3x+9)+1=0
Wy multiply elements
-36x(3+1=0
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