72=4.5xr

Solution for 72=4.5xr equation:

Simplifying
72 = 4.5xr

Solving
72 = 4.5rx

Solving for variable 'r'.

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

Add '-4.5rx' to each side of the equation.
72 + -4.5rx = 4.5rx + -4.5rx

Combine like terms: 4.5rx + -4.5rx = 0.0
72 + -4.5rx = 0.0

Add '-72' to each side of the equation.
72 + -72 + -4.5rx = 0.0 + -72

Combine like terms: 72 + -72 = 0
0 + -4.5rx = 0.0 + -72
-4.5rx = 0.0 + -72

Combine like terms: 0.0 + -72 = -72
-4.5rx = -72

Divide each side by '-4.5x'.
r = 16x-1

Simplifying
r = 16x-1