Solve for r
r=6
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-15r-24+4r=-90
Use the distributive property to multiply -3 by 5r+8.
-11r-24=-90
Combine -15r and 4r to get -11r.
-11r=-90+24
Add 24 to both sides.
-11r=-66
Add -90 and 24 to get -66.
r=\frac{-66}{-11}
Divide both sides by -11.
r=6
Divide -66 by -11 to get 6.
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