6(1-2a)+9a=-9

Solution for 6(1-2a)+9a=-9 equation:

Simplifying
6(1 + -2a) + 9a = -9
(1 * 6 + -2a * 6) + 9a = -9
(6 + -12a) + 9a = -9

Combine like terms: -12a + 9a = -3a
6 + -3a = -9

Solving
6 + -3a = -9

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 = -9 + -6

Combine like terms: 6 + -6 = 0
0 + -3a = -9 + -6
-3a = -9 + -6

Combine like terms: -9 + -6 = -15
-3a = -15

Divide each side by '-3'.
a = 5

Simplifying
a = 5