.5x-3.1=.4

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Solution for .5x-3.1=.4 equation: 


Simplifying
0.5x + -3.1 = 0.4

Reorder the terms:
-3.1 + 0.5x = 0.4

Solving
-3.1 + 0.5x = 0.4

Solving for variable 'x'.

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

Add '3.1' to each side of the equation.
-3.1 + 3.1 + 0.5x = 0.4 + 3.1

Combine like terms: -3.1 + 3.1 = 0.0
0.0 + 0.5x = 0.4 + 3.1
0.5x = 0.4 + 3.1

Combine like terms: 0.4 + 3.1 = 3.5
0.5x = 3.5

Divide each side by '0.5'.
x = 7

Simplifying
x = 7

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