15=-7a-8a

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Solution for 15=-7a-8a equation:


Simplifying
15 = -7a + -8a

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

Solving
15 = -15a

Solving for variable 'a'.

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

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

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

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

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

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

Divide each side by '15'.
a = -1

Simplifying
a = -1

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