0.4x-0.2(3-x)=2.1

Solution for 0.4x-0.2(3-x)=2.1 equation:

Simplifying
0.4x + -0.2(3 + -1x) = 2.1
0.4x + (3 * -0.2 + -1x * -0.2) = 2.1
0.4x + (-0.6 + 0.2x) = 2.1

Reorder the terms:
-0.6 + 0.4x + 0.2x = 2.1

Combine like terms: 0.4x + 0.2x = 0.6x
-0.6 + 0.6x = 2.1

Solving
-0.6 + 0.6x = 2.1

Solving for variable 'x'.

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

Add '0.6' to each side of the equation.
-0.6 + 0.6 + 0.6x = 2.1 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.6x = 2.1 + 0.6
0.6x = 2.1 + 0.6

Combine like terms: 2.1 + 0.6 = 2.7
0.6x = 2.7

Divide each side by '0.6'.
x = 4.5

Simplifying
x = 4.5