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

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

Simplifying
(a + 6)(a + -9) = -6a

Reorder the terms:
(6 + a)(a + -9) = -6a

Reorder the terms:
(6 + a)(-9 + a) = -6a

Multiply (6 + a) * (-9 + a)
(6(-9 + a) + a(-9 + a)) = -6a
((-9 * 6 + a * 6) + a(-9 + a)) = -6a
((-54 + 6a) + a(-9 + a)) = -6a
(-54 + 6a + (-9 * a + a * a)) = -6a
(-54 + 6a + (-9a + a2)) = -6a

Combine like terms: 6a + -9a = -3a
(-54 + -3a + a2) = -6a

Solving
-54 + -3a + a2 = -6a

Solving for variable 'a'.

Reorder the terms:
-54 + -3a + 6a + a2 = -6a + 6a

Combine like terms: -3a + 6a = 3a
-54 + 3a + a2 = -6a + 6a

Combine like terms: -6a + 6a = 0
-54 + 3a + a2 = 0

Factor a trinomial.
(-9 + -1a)(6 + -1a) = 0

Subproblem 1
Set the factor '(-9 + -1a)' equal to zero and attempt to solve:

Simplifying
-9 + -1a = 0

Solving
-9 + -1a = 0

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

Add '9' to each side of the equation.
-9 + 9 + -1a = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1a = 0 + 9
-1a = 0 + 9

Combine like terms: 0 + 9 = 9
-1a = 9

Divide each side by '-1'.
a = -9

Simplifying
a = -9
Subproblem 2
Set the factor '(6 + -1a)' equal to zero and attempt to solve:

Simplifying
6 + -1a = 0

Solving
6 + -1a = 0

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

Add '-6' to each side of the equation.
6 + -6 + -1a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -1a = 0 + -6
-1a = 0 + -6

Combine like terms: 0 + -6 = -6
-1a = -6

Divide each side by '-1'.
a = 6

Simplifying
a = 6
Solution
a = {-9, 6}