-6a+6+9a=-18

Solution for -6a+6+9a=-18 equation:

Simplifying
-6a + 6 + 9a = -18

Reorder the terms:
6 + -6a + 9a = -18

Combine like terms: -6a + 9a = 3a
6 + 3a = -18

Solving
6 + 3a = -18

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + 3a = -18 + -6

Combine like terms: 6 + -6 = 0
0 + 3a = -18 + -6
3a = -18 + -6

Combine like terms: -18 + -6 = -24
3a = -24

Divide each side by '3'.
a = -8

Simplifying
a = -8