39.99*0.40=x

Solution for 39.99*0.40=x equation:

Simplifying
39.99 * 0.40 = x

Multiply 39.99 * 0.40
15.996 = x

Solving
15.996 = 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.
15.996 + -1x = x + -1x

Combine like terms: x + -1x = 0
15.996 + -1x = 0

Add '-15.996' to each side of the equation.
15.996 + -15.996 + -1x = 0 + -15.996

Combine like terms: 15.996 + -15.996 = 0.000
0.000 + -1x = 0 + -15.996
-1x = 0 + -15.996

Combine like terms: 0 + -15.996 = -15.996
-1x = -15.996

Divide each side by '-1'.
x = 15.996

Simplifying
x = 15.996