5r-8r=9

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Solution for 5r-8r=9 equation: 


Simplifying
5r + -8r = 9

Combine like terms: 5r + -8r = -3r
-3r = 9

Solving
-3r = 9

Solving for variable 'r'.

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

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

Simplifying
r = -3

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