r+r=18

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Solution for r+r=18 equation: 


Simplifying
r + r = 18

Combine like terms: r + r = 2r
2r = 18

Solving
2r = 18

Solving for variable 'r'.

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

Divide each side by '2'.
r = 9

Simplifying
r = 9

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