3x-(-3.1)=12.4

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Solution for 3x-(-3.1)=12.4 equation: 


Simplifying
3x + -1(-3.1) = 12.4

Multiply -1 * -3.1
3x + 3.1 = 12.4

Reorder the terms:
3.1 + 3x = 12.4

Solving
3.1 + 3x = 12.4

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 + 3x = 12.4 + -3.1

Combine like terms: 3.1 + -3.1 = 0.0
0.0 + 3x = 12.4 + -3.1
3x = 12.4 + -3.1

Combine like terms: 12.4 + -3.1 = 9.3
3x = 9.3

Divide each side by '3'.
x = 3.1

Simplifying
x = 3.1

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