15=9-3(a+2)

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Solution for 15=9-3(a+2) equation:


Simplifying
15 = 9 + -3(a + 2)

Reorder the terms:
15 = 9 + -3(2 + a)
15 = 9 + (2 * -3 + a * -3)
15 = 9 + (-6 + -3a)

Combine like terms: 9 + -6 = 3
15 = 3 + -3a

Solving
15 = 3 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
15 + 3a = 3 + -3a + 3a

Combine like terms: -3a + 3a = 0
15 + 3a = 3 + 0
15 + 3a = 3

Add '-15' to each side of the equation.
15 + -15 + 3a = 3 + -15

Combine like terms: 15 + -15 = 0
0 + 3a = 3 + -15
3a = 3 + -15

Combine like terms: 3 + -15 = -12
3a = -12

Divide each side by '3'.
a = -4

Simplifying
a = -4

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