72=4r

Solution for 72=4r equation:

Simplifying
72 = 4r

Solving
72 = 4r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-4r' to each side of the equation.
72 + -4r = 4r + -4r

Combine like terms: 4r + -4r = 0
72 + -4r = 0

Add '-72' to each side of the equation.
72 + -72 + -4r = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -4r = 0 + -72
-4r = 0 + -72

Combine like terms: 0 + -72 = -72
-4r = -72

Divide each side by '-4'.
r = 18

Simplifying
r = 18