.4-3x=13

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Solution for .4-3x=13 equation: 


Simplifying
0.4 + -3x = 13

Solving
0.4 + -3x = 13

Solving for variable 'x'.

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

Add '-0.4' to each side of the equation.
0.4 + -0.4 + -3x = 13 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + -3x = 13 + -0.4
-3x = 13 + -0.4

Combine like terms: 13 + -0.4 = 12.6
-3x = 12.6

Divide each side by '-3'.
x = -4.2

Simplifying
x = -4.2

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