0.4x^2+0.12rx=0

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Solution for 0.4x^2+0.12rx=0 equation: 


Simplifying
0.4x2 + 0.12rx = 0

Reorder the terms:
0.12rx + 0.4x2 = 0

Solving
0.12rx + 0.4x2 = 0

Solving for variable 'r'.

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

Add '-0.4x2' to each side of the equation.
0.12rx + 0.4x2 + -0.4x2 = 0 + -0.4x2

Combine like terms: 0.4x2 + -0.4x2 = 0.0
0.12rx + 0.0 = 0 + -0.4x2
0.12rx = 0 + -0.4x2
Remove the zero:
0.12rx = -0.4x2

Divide each side by '0.12x'.
r = -3.333333333x

Simplifying
r = -3.333333333x

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