.5-.4x=.3

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Solution for .5-.4x=.3 equation: 


Simplifying
0.5 + -0.4x = 0.3

Solving
0.5 + -0.4x = 0.3

Solving for variable 'x'.

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

Add '-0.5' to each side of the equation.
0.5 + -0.5 + -0.4x = 0.3 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -0.4x = 0.3 + -0.5
-0.4x = 0.3 + -0.5

Combine like terms: 0.3 + -0.5 = -0.2
-0.4x = -0.2

Divide each side by '-0.4'.
x = 0.5

Simplifying
x = 0.5

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