r*9=108

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Solution for r*9=108 equation: 


Simplifying
r * 9 = 108

Reorder the terms for easier multiplication:
9r = 108

Solving
9r = 108

Solving for variable 'r'.

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

Divide each side by '9'.
r = 12

Simplifying
r = 12

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