(63r^9)/(7r^2)

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Solution for (63r^9)/(7r^2) equation: 


D( r )

7*r^2 = 0

7*r^2 = 0

7*r^2 = 0

7*r^2 = 0 // : 7

r^2 = 0

r = 0

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

(63*r^9)/(7*r^2) = 0

9*r^7 = 0 // : 9

r^7 = 0

r = 0

r in { 0} 

r belongs to the empty set

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