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2r+12=4\left(2r-24\right)
Multiply both sides of the equation by 8, the least common multiple of 8,2.
2r+12=8r-96
Use the distributive property to multiply 4 by 2r-24.
2r+12-8r=-96
Subtract 8r from both sides.
-6r+12=-96
Combine 2r and -8r to get -6r.
-6r=-96-12
Subtract 12 from both sides.
-6r=-108
Subtract 12 from -96 to get -108.
r=\frac{-108}{-6}
Divide both sides by -6.
r=18
Divide -108 by -6 to get 18.