(a+3)(a-3)-a(a+5)=6

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Solution for (a+3)(a-3)-a(a+5)=6 equation:


Simplifying
(a + 3)(a + -3) + -1a(a + 5) = 6

Reorder the terms:
(3 + a)(a + -3) + -1a(a + 5) = 6

Reorder the terms:
(3 + a)(-3 + a) + -1a(a + 5) = 6

Multiply (3 + a) * (-3 + a)
(3(-3 + a) + a(-3 + a)) + -1a(a + 5) = 6
((-3 * 3 + a * 3) + a(-3 + a)) + -1a(a + 5) = 6
((-9 + 3a) + a(-3 + a)) + -1a(a + 5) = 6
(-9 + 3a + (-3 * a + a * a)) + -1a(a + 5) = 6
(-9 + 3a + (-3a + a2)) + -1a(a + 5) = 6

Combine like terms: 3a + -3a = 0
(-9 + 0 + a2) + -1a(a + 5) = 6
(-9 + a2) + -1a(a + 5) = 6

Reorder the terms:
-9 + a2 + -1a(5 + a) = 6
-9 + a2 + (5 * -1a + a * -1a) = 6
-9 + a2 + (-5a + -1a2) = 6

Reorder the terms:
-9 + -5a + a2 + -1a2 = 6

Combine like terms: a2 + -1a2 = 0
-9 + -5a + 0 = 6
-9 + -5a = 6

Solving
-9 + -5a = 6

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + -5a = 6 + 9

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

Combine like terms: 6 + 9 = 15
-5a = 15

Divide each side by '-5'.
a = -3

Simplifying
a = -3

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