-15=4a-a

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Solution for -15=4a-a equation:


Simplifying
-15 = 4a + -1a

Combine like terms: 4a + -1a = 3a
-15 = 3a

Solving
-15 = 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
-15 + -3a = 3a + -3a

Combine like terms: 3a + -3a = 0
-15 + -3a = 0

Add '15' to each side of the equation.
-15 + 15 + -3a = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -3a = 0 + 15
-3a = 0 + 15

Combine like terms: 0 + 15 = 15
-3a = 15

Divide each side by '-3'.
a = -5

Simplifying
a = -5

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