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12r+9=3/5(15r-20)
We move all terms to the left:
12r+9-(3/5(15r-20))=0
Domain of the equation: 5(15r-20))!=0We multiply all the terms by the denominator
r∈R
12r*5(15r-20))-(3+9*5(15r-20))=0
Wy multiply elements
60r^2(1+45r(1=0
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