-x+0.4x+1.8=-4.2

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Solution for -x+0.4x+1.8=-4.2 equation: 


Simplifying
-1x + 0.4x + 1.8 = -4.2

Reorder the terms:
1.8 + -1x + 0.4x = -4.2

Combine like terms: -1x + 0.4x = -0.6x
1.8 + -0.6x = -4.2

Solving
1.8 + -0.6x = -4.2

Solving for variable 'x'.

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

Add '-1.8' to each side of the equation.
1.8 + -1.8 + -0.6x = -4.2 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + -0.6x = -4.2 + -1.8
-0.6x = -4.2 + -1.8

Combine like terms: -4.2 + -1.8 = -6
-0.6x = -6

Divide each side by '-0.6'.
x = 10

Simplifying
x = 10

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