9r-8=91

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Solution for 9r-8=91 equation: 


Simplifying
9r + -8 = 91

Reorder the terms:
-8 + 9r = 91

Solving
-8 + 9r = 91

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + 9r = 91 + 8

Combine like terms: -8 + 8 = 0
0 + 9r = 91 + 8
9r = 91 + 8

Combine like terms: 91 + 8 = 99
9r = 99

Divide each side by '9'.
r = 11

Simplifying
r = 11

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