-0.4r=-20

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Solution for -0.4r=-20 equation: 


Simplifying
-0.4r = -20

Solving
-0.4r = -20

Solving for variable 'r'.

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

Divide each side by '-0.4'.
r = 50

Simplifying
r = 50

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