13r-16r=21

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Solution for 13r-16r=21 equation: 


Simplifying
13r + -16r = 21

Combine like terms: 13r + -16r = -3r
-3r = 21

Solving
-3r = 21

Solving for variable 'r'.

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

Divide each side by '-3'.
r = -7

Simplifying
r = -7

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