4r+5r=-81

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Solution for 4r+5r=-81 equation: 


Simplifying
4r + 5r = -81

Combine like terms: 4r + 5r = 9r
9r = -81

Solving
9r = -81

Solving for variable 'r'.

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

Divide each side by '9'.
r = -9

Simplifying
r = -9

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