x-3.9=-12.4

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Solution for x-3.9=-12.4 equation: 


Simplifying
x + -3.9 = -12.4

Reorder the terms:
-3.9 + x = -12.4

Solving
-3.9 + x = -12.4

Solving for variable 'x'.

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

Add '3.9' to each side of the equation.
-3.9 + 3.9 + x = -12.4 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + x = -12.4 + 3.9
x = -12.4 + 3.9

Combine like terms: -12.4 + 3.9 = -8.5
x = -8.5

Simplifying
x = -8.5

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