-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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