0.3r=2.1

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Solution for 0.3r=2.1 equation: 


Simplifying
0.3r = 2.1

Solving
0.3r = 2.1

Solving for variable 'r'.

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

Divide each side by '0.3'.
r = 7

Simplifying
r = 7

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