135=75+0.8r

Rewrite the equation as 75+0.8r=135.

75+0.8r=135

Subtract 75 from both sides of the equation.

0.8r=135-75

Subtract 75 from 135.

0.8r=60

0.8r=60

Divide each term in 0.8r=60 by 0.8.

0.8r0.8=600.8

Cancel the common factor of 0.8.

r=600.8

Divide 60 by 0.8.

r=75

r=75

Solve for r 135=75+0.80r