-(-9-9a)=4(a+6)

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Solution for -(-9-9a)=4(a+6) equation:


Simplifying
-1(-9 + -9a) = 4(a + 6)
(-9 * -1 + -9a * -1) = 4(a + 6)
(9 + 9a) = 4(a + 6)

Reorder the terms:
9 + 9a = 4(6 + a)
9 + 9a = (6 * 4 + a * 4)
9 + 9a = (24 + 4a)

Solving
9 + 9a = 24 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
9 + 9a + -4a = 24 + 4a + -4a

Combine like terms: 9a + -4a = 5a
9 + 5a = 24 + 4a + -4a

Combine like terms: 4a + -4a = 0
9 + 5a = 24 + 0
9 + 5a = 24

Add '-9' to each side of the equation.
9 + -9 + 5a = 24 + -9

Combine like terms: 9 + -9 = 0
0 + 5a = 24 + -9
5a = 24 + -9

Combine like terms: 24 + -9 = 15
5a = 15

Divide each side by '5'.
a = 3

Simplifying
a = 3

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