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3\left(9-4r\right)=72+8
Multiply both sides of the equation by 24, the least common multiple of 8,3.
27-12r=72+8
Use the distributive property to multiply 3 by 9-4r.
27-12r=80
Add 72 and 8 to get 80.
-12r=80-27
Subtract 27 from both sides.
-12r=53
Subtract 27 from 80 to get 53.
r=\frac{53}{-12}
Divide both sides by -12.
r=-\frac{53}{12}
Fraction \frac{53}{-12} can be rewritten as -\frac{53}{12} by extracting the negative sign.