(-a)+8=15

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


Simplifying
(-1a) + 8 = 15

Reorder the terms:
8 + (-1a) = 15

Solving
8 + (-1a) = 15

Solving for variable 'a'.

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

Add '-8' to each side of the equation.
8 + -8 + (-1a) = 15 + -8

Combine like terms: 8 + -8 = 0
0 + (-1a) = 15 + -8
(-1a) = 15 + -8

Combine like terms: 15 + -8 = 7
(-1a) = 7

Divide each side by '-1'.
a = -7

Simplifying
a = -7

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