15=8+9(-a)

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Solution for 15=8+9(-a) equation:


Simplifying
15 = 8 + 9(-1a)

Remove parenthesis around (-1a)
15 = 8 + 9 * -1a

Multiply 9 * -1
15 = 8 + -9a

Solving
15 = 8 + -9a

Solving for variable 'a'.

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

Add '9a' to each side of the equation.
15 + 9a = 8 + -9a + 9a

Combine like terms: -9a + 9a = 0
15 + 9a = 8 + 0
15 + 9a = 8

Add '-15' to each side of the equation.
15 + -15 + 9a = 8 + -15

Combine like terms: 15 + -15 = 0
0 + 9a = 8 + -15
9a = 8 + -15

Combine like terms: 8 + -15 = -7
9a = -7

Divide each side by '9'.
a = -0.7777777778

Simplifying
a = -0.7777777778

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