12-4(a+2)=9+a

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Solution for 12-4(a+2)=9+a equation:


Simplifying
12 + -4(a + 2) = 9 + a

Reorder the terms:
12 + -4(2 + a) = 9 + a
12 + (2 * -4 + a * -4) = 9 + a
12 + (-8 + -4a) = 9 + a

Combine like terms: 12 + -8 = 4
4 + -4a = 9 + a

Solving
4 + -4a = 9 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
4 + -4a + -1a = 9 + a + -1a

Combine like terms: -4a + -1a = -5a
4 + -5a = 9 + a + -1a

Combine like terms: a + -1a = 0
4 + -5a = 9 + 0
4 + -5a = 9

Add '-4' to each side of the equation.
4 + -4 + -5a = 9 + -4

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

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

Divide each side by '-5'.
a = -1

Simplifying
a = -1

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