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x-9=1/3(x-12)
We move all terms to the left:
x-9-(1/3(x-12))=0
Domain of the equation: 3(x-12))!=0We multiply all the terms by the denominator
x∈R
x*3(x-12))-(1-9*3(x-12))=0
Wy multiply elements
3x^2(x-27x(x=0
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