72=4a

Solution for 72=4a equation:

Simplifying
72 = 4a

Solving
72 = 4a

Solving for variable 'a'.

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

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

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

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

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

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

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

Simplifying
a = 18