r+9=20

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Solution for r+9=20 equation: 


Simplifying
r + 9 = 20

Reorder the terms:
9 + r = 20

Solving
9 + r = 20

Solving for variable 'r'.

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

Add '-9' to each side of the equation.
9 + -9 + r = 20 + -9

Combine like terms: 9 + -9 = 0
0 + r = 20 + -9
r = 20 + -9

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

Simplifying
r = 11

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