31.2=12.8-(-2.3x)

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Solution for 31.2=12.8-(-2.3x) equation: 


Simplifying
31.2 = 12.8 + -1(-2.3x)

Remove parenthesis around (-2.3x)
31.2 = 12.8 + -1 * -2.3x

Multiply -1 * -2.3
31.2 = 12.8 + 2.3x

Solving
31.2 = 12.8 + 2.3x

Solving for variable 'x'.

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

Add '-2.3x' to each side of the equation.
31.2 + -2.3x = 12.8 + 2.3x + -2.3x

Combine like terms: 2.3x + -2.3x = 0.0
31.2 + -2.3x = 12.8 + 0.0
31.2 + -2.3x = 12.8

Add '-31.2' to each side of the equation.
31.2 + -31.2 + -2.3x = 12.8 + -31.2

Combine like terms: 31.2 + -31.2 = 0.0
0.0 + -2.3x = 12.8 + -31.2
-2.3x = 12.8 + -31.2

Combine like terms: 12.8 + -31.2 = -18.4
-2.3x = -18.4

Divide each side by '-2.3'.
x = 8

Simplifying
x = 8

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