r*21=84

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Solution for r*21=84 equation: 


Simplifying
r * 21 = 84

Reorder the terms for easier multiplication:
21r = 84

Solving
21r = 84

Solving for variable 'r'.

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

Divide each side by '21'.
r = 4

Simplifying
r = 4

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