3.6=.72(a+6)

Solution for 3.6=.72(a+6) equation:

Simplifying
3.6 = 0.72(a + 6)

Reorder the terms:
3.6 = 0.72(6 + a)
3.6 = (6 * 0.72 + a * 0.72)
3.6 = (4.32 + 0.72a)

Solving
3.6 = 4.32 + 0.72a

Solving for variable 'a'.

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

Add '-0.72a' to each side of the equation.
3.6 + -0.72a = 4.32 + 0.72a + -0.72a

Combine like terms: 0.72a + -0.72a = 0.00
3.6 + -0.72a = 4.32 + 0.00
3.6 + -0.72a = 4.32

Add '-3.6' to each side of the equation.
3.6 + -3.6 + -0.72a = 4.32 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -0.72a = 4.32 + -3.6
-0.72a = 4.32 + -3.6

Combine like terms: 4.32 + -3.6 = 0.72
-0.72a = 0.72

Divide each side by '-0.72'.
a = -1

Simplifying
a = -1