0.2(0.1x+0.1)=-0.4

Solution for 0.2(0.1x+0.1)=-0.4 equation:

Simplifying
0.2(0.1x + 0.1) = -0.4

Reorder the terms:
0.2(0.1 + 0.1x) = -0.4
(0.1 * 0.2 + 0.1x * 0.2) = -0.4
(0.02 + 0.02x) = -0.4

Solving
0.02 + 0.02x = -0.4

Solving for variable 'x'.

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

Add '-0.02' to each side of the equation.
0.02 + -0.02 + 0.02x = -0.4 + -0.02

Combine like terms: 0.02 + -0.02 = 0.00
0.00 + 0.02x = -0.4 + -0.02
0.02x = -0.4 + -0.02

Combine like terms: -0.4 + -0.02 = -0.42
0.02x = -0.42

Divide each side by '0.02'.
x = -21

Simplifying
x = -21