3r+9r=60

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Solution for 3r+9r=60 equation: 


Simplifying
3r + 9r = 60

Combine like terms: 3r + 9r = 12r
12r = 60

Solving
12r = 60

Solving for variable 'r'.

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

Divide each side by '12'.
r = 5

Simplifying
r = 5

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