12r+30-72=0

Solution for 12r+30-72=0 equation:

Simplifying
12r + 30 + -72 = 0

Reorder the terms:
30 + -72 + 12r = 0

Combine like terms: 30 + -72 = -42
-42 + 12r = 0

Solving
-42 + 12r = 0

Solving for variable 'r'.

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

Add '42' to each side of the equation.
-42 + 42 + 12r = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 12r = 0 + 42
12r = 0 + 42

Combine like terms: 0 + 42 = 42
12r = 42

Divide each side by '12'.
r = 3.5

Simplifying
r = 3.5