-72+9a=15a

Solution for -72+9a=15a equation:

Simplifying
-72 + 9a = 15a

Solving
-72 + 9a = 15a

Solving for variable 'a'.

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

Add '-15a' to each side of the equation.
-72 + 9a + -15a = 15a + -15a

Combine like terms: 9a + -15a = -6a
-72 + -6a = 15a + -15a

Combine like terms: 15a + -15a = 0
-72 + -6a = 0

Add '72' to each side of the equation.
-72 + 72 + -6a = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -6a = 0 + 72
-6a = 0 + 72

Combine like terms: 0 + 72 = 72
-6a = 72

Divide each side by '-6'.
a = -12

Simplifying
a = -12