r+20=2S

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Solution for r+20=2S equation: 


Simplifying
r + 20 = 2S

Reorder the terms:
20 + r = 2S

Solving
20 + r = 2S

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 = -20 + 2S

Combine like terms: 20 + -20 = 0
0 + r = -20 + 2S
r = -20 + 2S

Simplifying
r = -20 + 2S

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