6.4=-0.4r

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Solution for 6.4=-0.4r equation: 


Simplifying
6.4 = -0.4r

Solving
6.4 = -0.4r

Solving for variable 'r'.

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

Add '0.4r' to each side of the equation.
6.4 + 0.4r = -0.4r + 0.4r

Combine like terms: -0.4r + 0.4r = 0.0
6.4 + 0.4r = 0.0

Add '-6.4' to each side of the equation.
6.4 + -6.4 + 0.4r = 0.0 + -6.4

Combine like terms: 6.4 + -6.4 = 0.0
0.0 + 0.4r = 0.0 + -6.4
0.4r = 0.0 + -6.4

Combine like terms: 0.0 + -6.4 = -6.4
0.4r = -6.4

Divide each side by '0.4'.
r = -16

Simplifying
r = -16

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