11+3r=20

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Solution for 11+3r=20 equation: 


Simplifying
11 + 3r = 20

Solving
11 + 3r = 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 + 3r = 20 + -11

Combine like terms: 11 + -11 = 0
0 + 3r = 20 + -11
3r = 20 + -11

Combine like terms: 20 + -11 = 9
3r = 9

Divide each side by '3'.
r = 3

Simplifying
r = 3

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