(3-15a)-(9+7a)=

Solution for (3-15a)-(9+7a)= equation:

Simplifying
(3 + -15a) + -1(9 + 7a) = 0

Remove parenthesis around (3 + -15a)
3 + -15a + -1(9 + 7a) = 0
3 + -15a + (9 * -1 + 7a * -1) = 0
3 + -15a + (-9 + -7a) = 0

Reorder the terms:
3 + -9 + -15a + -7a = 0

Combine like terms: 3 + -9 = -6
-6 + -15a + -7a = 0

Combine like terms: -15a + -7a = -22a
-6 + -22a = 0

Solving
-6 + -22a = 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 + -22a = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -22a = 0 + 6
-22a = 0 + 6

Combine like terms: 0 + 6 = 6
-22a = 6

Divide each side by '-22'.
a = -0.2727272727

Simplifying
a = -0.2727272727