21-2r/r=5

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Solution for 21-2r/r=5 equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

21-((2*r)/r) = 5 // - 5

21-((2*r)/r)-5 = 0

21-5-2 = 0

14 = 0

r belongs to the empty set

r belongs to the empty set

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