Move all terms not containing r to the right side of the equation.
Add 4 to both sides of the equation.
Add 11 and 4.
Divide each term by 3 and simplify.
Divide each term in 3r=15 by 3.
Cancel the common factor of 3.
Cancel the common factor.
Divide r by 1.
Divide 15 by 3.
Solve for r 3r-4=11