11r-21=100

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Solution for 11r-21=100 equation: 


Simplifying
11r + -21 = 100

Reorder the terms:
-21 + 11r = 100

Solving
-21 + 11r = 100

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 + 11r = 100 + 21

Combine like terms: -21 + 21 = 0
0 + 11r = 100 + 21
11r = 100 + 21

Combine like terms: 100 + 21 = 121
11r = 121

Divide each side by '11'.
r = 11

Simplifying
r = 11

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