r*13=13

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Solution for r*13=13 equation: 


Simplifying
r * 13 = 13

Reorder the terms for easier multiplication:
13r = 13

Solving
13r = 13

Solving for variable 'r'.

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

Divide each side by '13'.
r = 1

Simplifying
r = 1

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