.4x+3.1=.8x-.5

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Solution for .4x+3.1=.8x-.5 equation:


Simplifying
0.4x + 3.1 = 0.8x + -0.5

Reorder the terms:
3.1 + 0.4x = 0.8x + -0.5

Reorder the terms:
3.1 + 0.4x = -0.5 + 0.8x

Solving
3.1 + 0.4x = -0.5 + 0.8x

Solving for variable 'x'.

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

Add '-0.8x' to each side of the equation.
3.1 + 0.4x + -0.8x = -0.5 + 0.8x + -0.8x

Combine like terms: 0.4x + -0.8x = -0.4x
3.1 + -0.4x = -0.5 + 0.8x + -0.8x

Combine like terms: 0.8x + -0.8x = 0.0
3.1 + -0.4x = -0.5 + 0.0
3.1 + -0.4x = -0.5

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

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

Combine like terms: -0.5 + -3.1 = -3.6
-0.4x = -3.6

Divide each side by '-0.4'.
x = 9

Simplifying
x = 9

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