-3a+15a+72=

Solution for -3a+15a+72= equation:

Simplifying
-3a + 15a + 72 = 0

Reorder the terms:
72 + -3a + 15a = 0

Combine like terms: -3a + 15a = 12a
72 + 12a = 0

Solving
72 + 12a = 0

Solving for variable 'a'.

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

Add '-72' to each side of the equation.
72 + -72 + 12a = 0 + -72

Combine like terms: 72 + -72 = 0
0 + 12a = 0 + -72
12a = 0 + -72

Combine like terms: 0 + -72 = -72
12a = -72

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

Simplifying
a = -6