Rewrite the equation as 75+0.8r=135.
Move all terms not containing r to the right side of the equation.
Subtract 75 from both sides of the equation.
Subtract 75 from 135.
Divide each term by 0.8 and simplify.
Divide each term in 0.8r=60 by 0.8.
Cancel the common factor of 0.8.
Divide 60 by 0.8.
Solve for r 135=75+0.80r