7r-4r=9

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Solution for 7r-4r=9 equation: 


Simplifying
7r + -4r = 9

Combine like terms: 7r + -4r = 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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