8.1=0.9a

Solution for 8.1=0.9a equation:

Simplifying
8.1 = 0.9a

Solving
8.1 = 0.9a

Solving for variable 'a'.

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

Add '-0.9a' to each side of the equation.
8.1 + -0.9a = 0.9a + -0.9a

Combine like terms: 0.9a + -0.9a = 0.0
8.1 + -0.9a = 0.0

Add '-8.1' to each side of the equation.
8.1 + -8.1 + -0.9a = 0.0 + -8.1

Combine like terms: 8.1 + -8.1 = 0.0
0.0 + -0.9a = 0.0 + -8.1
-0.9a = 0.0 + -8.1

Combine like terms: 0.0 + -8.1 = -8.1
-0.9a = -8.1

Divide each side by '-0.9'.
a = 9

Simplifying
a = 9