9a+3(a+3)-3=

Solution for 9a+3(a+3)-3= equation:

Simplifying
9a + 3(a + 3) + -3 = 0

Reorder the terms:
9a + 3(3 + a) + -3 = 0
9a + (3 * 3 + a * 3) + -3 = 0
9a + (9 + 3a) + -3 = 0

Reorder the terms:
9 + -3 + 9a + 3a = 0

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

Combine like terms: 9a + 3a = 12a
6 + 12a = 0

Solving
6 + 12a = 0

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 + 12a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 12a = 0 + -6
12a = 0 + -6

Combine like terms: 0 + -6 = -6
12a = -6

Divide each side by '12'.
a = -0.5

Simplifying
a = -0.5