5r^-2/7r^5

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Solution for 5r^-2/7r^5 equation: 


D( r )

r = 0

r = 0

r = 0

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

((5*r^-2)/7)*r^5 = 0

5/7*r^3 = 0 // : 5/7

r^3 = 0

r = 0

r in { 0} 

r belongs to the empty set

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