2r+r=12

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Solution for 2r+r=12 equation: 


Simplifying
2r + r = 12

Combine like terms: 2r + r = 3r
3r = 12

Solving
3r = 12

Solving for variable 'r'.

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

Divide each side by '3'.
r = 4

Simplifying
r = 4

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