5.5-8.1=x

Solution for 5.5-8.1=x equation:

Simplifying
5.5 + -8.1 = x

Combine like terms: 5.5 + -8.1 = -2.6
-2.6 = x

Solving
-2.6 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-2.6 + -1x = x + -1x

Combine like terms: x + -1x = 0
-2.6 + -1x = 0

Add '2.6' to each side of the equation.
-2.6 + 2.6 + -1x = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + -1x = 0 + 2.6
-1x = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
-1x = 2.6

Divide each side by '-1'.
x = -2.6

Simplifying
x = -2.6