8r-21=91

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Solution for 8r-21=91 equation: 


Simplifying
8r + -21 = 91

Reorder the terms:
-21 + 8r = 91

Solving
-21 + 8r = 91

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 8r = 91 + 21

Combine like terms: -21 + 21 = 0
0 + 8r = 91 + 21
8r = 91 + 21

Combine like terms: 91 + 21 = 112
8r = 112

Divide each side by '8'.
r = 14

Simplifying
r = 14

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