11+r=20

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Solution for 11+r=20 equation: 


Simplifying
11 + r = 20

Solving
11 + r = 20

Solving for variable 'r'.

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

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

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

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

Simplifying
r = 9

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