r/2=20

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Solution for r/2=20 equation: 


r in (-oo:+oo)

r/2 = 20 // - 20

r/2-20 = 0

1/2*r-20 = 0 // + 20

1/2*r = 20 // : 1/2

r = 20/1/2

r = 40

r = 40

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