15=a-3.6

Solution for 15=a-3.6 equation:

Simplifying
15 = a + -3.6

Reorder the terms:
15 = -3.6 + a

Solving
15 = -3.6 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
15 + -1a = -3.6 + a + -1a

Combine like terms: a + -1a = 0
15 + -1a = -3.6 + 0
15 + -1a = -3.6

Add '-15' to each side of the equation.
15 + -15 + -1a = -3.6 + -15

Combine like terms: 15 + -15 = 0
0 + -1a = -3.6 + -15
-1a = -3.6 + -15

Combine like terms: -3.6 + -15 = -18.6
-1a = -18.6

Divide each side by '-1'.
a = 18.6

Simplifying
a = 18.6