r+3r+2r=16

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Solution for r+3r+2r=16 equation: 


Simplifying
r + 3r + 2r = 16

Combine like terms: r + 3r = 4r
4r + 2r = 16

Combine like terms: 4r + 2r = 6r
6r = 16

Solving
6r = 16

Solving for variable 'r'.

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

Divide each side by '6'.
r = 2.666666667

Simplifying
r = 2.666666667

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