6=x-.4x

Solution for 6=x-.4x equation:

Simplifying
6 = x + -0.4x

Combine like terms: x + -0.4x = 0.6x
6 = 0.6x

Solving
6 = 0.6x

Solving for variable 'x'.

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

Add '-0.6x' to each side of the equation.
6 + -0.6x = 0.6x + -0.6x

Combine like terms: 0.6x + -0.6x = 0.0
6 + -0.6x = 0.0

Add '-6' to each side of the equation.
6 + -6 + -0.6x = 0.0 + -6

Combine like terms: 6 + -6 = 0
0 + -0.6x = 0.0 + -6
-0.6x = 0.0 + -6

Combine like terms: 0.0 + -6 = -6
-0.6x = -6

Divide each side by '-0.6'.
x = 10

Simplifying
x = 10