0.4*0.4=x

Solution for 0.4*0.4=x equation:

Simplifying
0.4 * 0.4 = x

Multiply 0.4 * 0.4
0.16 = x

Solving
0.16 = 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.
0.16 + -1x = x + -1x

Combine like terms: x + -1x = 0
0.16 + -1x = 0

Add '-0.16' to each side of the equation.
0.16 + -0.16 + -1x = 0 + -0.16

Combine like terms: 0.16 + -0.16 = 0.00
0.00 + -1x = 0 + -0.16
-1x = 0 + -0.16

Combine like terms: 0 + -0.16 = -0.16
-1x = -0.16

Divide each side by '-1'.
x = 0.16

Simplifying
x = 0.16