r-20=-11

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Solution for r-20=-11 equation: 


Simplifying
r + -20 = -11

Reorder the terms:
-20 + r = -11

Solving
-20 + r = -11

Solving for variable 'r'.

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

Add '20' to each side of the equation.
-20 + 20 + r = -11 + 20

Combine like terms: -20 + 20 = 0
0 + r = -11 + 20
r = -11 + 20

Combine like terms: -11 + 20 = 9
r = 9

Simplifying
r = 9

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