1a-15=4a

Solution for 1a-15=4a equation:

Simplifying
1a + -15 = 4a

Reorder the terms:
-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 = -3a
-15 + -3a = 4a + -4a

Combine like terms: 4a + -4a = 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