9(a+1)=[a-(4-a)]

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Solution for 9(a+1)=[a-(4-a)] equation:


Simplifying
9(a + 1) = [a + -1(4 + -1a)]

Reorder the terms:
9(1 + a) = [a + -1(4 + -1a)]
(1 * 9 + a * 9) = [a + -1(4 + -1a)]
(9 + 9a) = [a + -1(4 + -1a)]
9 + 9a = [a + (4 * -1 + -1a * -1)]
9 + 9a = [a + (-4 + 1a)]

Reorder the terms:
9 + 9a = [-4 + a + 1a]

Combine like terms: a + 1a = 2a
9 + 9a = [-4 + 2a]

Remove brackets around [-4 + 2a]
9 + 9a = -4 + 2a

Solving
9 + 9a = -4 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
9 + 9a + -2a = -4 + 2a + -2a

Combine like terms: 9a + -2a = 7a
9 + 7a = -4 + 2a + -2a

Combine like terms: 2a + -2a = 0
9 + 7a = -4 + 0
9 + 7a = -4

Add '-9' to each side of the equation.
9 + -9 + 7a = -4 + -9

Combine like terms: 9 + -9 = 0
0 + 7a = -4 + -9
7a = -4 + -9

Combine like terms: -4 + -9 = -13
7a = -13

Divide each side by '7'.
a = -1.857142857

Simplifying
a = -1.857142857

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