(9-3a)-(3-5a)=

Solution for (9-3a)-(3-5a)= equation:

Simplifying
(9 + -3a) + -1(3 + -5a) = 0

Remove parenthesis around (9 + -3a)
9 + -3a + -1(3 + -5a) = 0
9 + -3a + (3 * -1 + -5a * -1) = 0
9 + -3a + (-3 + 5a) = 0

Reorder the terms:
9 + -3 + -3a + 5a = 0

Combine like terms: 9 + -3 = 6
6 + -3a + 5a = 0

Combine like terms: -3a + 5a = 2a
6 + 2a = 0

Solving
6 + 2a = 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 + 2a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 2a = 0 + -6
2a = 0 + -6

Combine like terms: 0 + -6 = -6
2a = -6

Divide each side by '2'.
a = -3

Simplifying
a = -3