0.4x-0.8(3-x)=4.2

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Solution for 0.4x-0.8(3-x)=4.2 equation: 


Simplifying
0.4x + -0.8(3 + -1x) = 4.2
0.4x + (3 * -0.8 + -1x * -0.8) = 4.2
0.4x + (-2.4 + 0.8x) = 4.2

Reorder the terms:
-2.4 + 0.4x + 0.8x = 4.2

Combine like terms: 0.4x + 0.8x = 1.2x
-2.4 + 1.2x = 4.2

Solving
-2.4 + 1.2x = 4.2

Solving for variable 'x'.

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

Add '2.4' to each side of the equation.
-2.4 + 2.4 + 1.2x = 4.2 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 1.2x = 4.2 + 2.4
1.2x = 4.2 + 2.4

Combine like terms: 4.2 + 2.4 = 6.6
1.2x = 6.6

Divide each side by '1.2'.
x = 5.5

Simplifying
x = 5.5

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