45/r=9

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Solution for 45/r=9 equation: 


D( r )

r = 0

r = 0

r = 0

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

45/r = 9 // - 9

45/r-9 = 0

45*r^-1 = 9 // : 45

r^-1 = 1/5

-1 < 0

1/(r^1) = 1/5 // * r^1

1 = 1/5*r^1 // : 1/5

5 = r^1

r = 5

r = 5

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