2r-9r=5.5

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Solution for 2r-9r=5.5 equation: 


Simplifying
2r + -9r = 5.5

Combine like terms: 2r + -9r = -7r
-7r = 5.5

Solving
-7r = 5.5

Solving for variable 'r'.

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

Divide each side by '-7'.
r = -0.7857142857

Simplifying
r = -0.7857142857

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