15=-a

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Solution for 15=-a equation:


Simplifying
15 = -1a

Solving
15 = -1a

Solving for variable 'a'.

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

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

Combine like terms: -1a + a = 0
15 + a = 0

Add '-15' to each side of the equation.
15 + -15 + a = 0 + -15

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

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

Simplifying
a = -15

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