15-a=4a

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Solution for 15-a=4a equation:


Simplifying
15 + -1a = 4a

Solving
15 + -1a = 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
15 + -1a + -4a = 4a + -4a

Combine like terms: -1a + -4a = -5a
15 + -5a = 4a + -4a

Combine like terms: 4a + -4a = 0
15 + -5a = 0

Add '-15' to each side of the equation.
15 + -15 + -5a = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -5a = 0 + -15
-5a = 0 + -15

Combine like terms: 0 + -15 = -15
-5a = -15

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

Simplifying
a = 3

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