15=8+(-a)

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


Simplifying
15 = 8 + (-1a)

Solving
15 = 8 + (-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) = 8 + (-1a) + (a)
15 + a = 8 + (-1a) + (a)
15 + a = 8 + (-1a) + a

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

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

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

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

Simplifying
a = -7

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