1=r/20

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Solution for 1=r/20 equation: 


r in (-oo:+oo)

1 = r/20 // - r/20

1-(r/20) = 0

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

-1/20*r = -1 // : -1/20

r = -1/(-1/20)

r = 20

r = 20

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