15=-7a+5a

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Solution for 15=-7a+5a equation:


Simplifying
15 = -7a + 5a

Combine like terms: -7a + 5a = -2a
15 = -2a

Solving
15 = -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
15 + 2a = -2a + 2a

Combine like terms: -2a + 2a = 0
15 + 2a = 0

Add '-15' to each side of the equation.
15 + -15 + 2a = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 2a = 0 + -15
2a = 0 + -15

Combine like terms: 0 + -15 = -15
2a = -15

Divide each side by '2'.
a = -7.5

Simplifying
a = -7.5

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