20-2r=s

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Solution for 20-2r=s equation: 


Simplifying
20 + -2r = s

Solving
20 + -2r = s

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 + -2r = -20 + s

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

Divide each side by '-2'.
r = 10 + -0.5s

Simplifying
r = 10 + -0.5s

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