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

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Solution for -3(7a+9)-15a=0 equation:


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

Reorder the terms:
-3(9 + 7a) + -15a = 0
(9 * -3 + 7a * -3) + -15a = 0
(-27 + -21a) + -15a = 0

Combine like terms: -21a + -15a = -36a
-27 + -36a = 0

Solving
-27 + -36a = 0

Solving for variable 'a'.

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

Add '27' to each side of the equation.
-27 + 27 + -36a = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -36a = 0 + 27
-36a = 0 + 27

Combine like terms: 0 + 27 = 27
-36a = 27

Divide each side by '-36'.
a = -0.75

Simplifying
a = -0.75

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