16/r=36/45

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Solution for 16/r=36/45 equation: 


D( r )

r = 0

r = 0

r = 0

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

16/r = 36/45 // - 36/45

16/r-(36/45) = 0

16/r-4/5 = 0

16*r^-1 = 4/5 // : 16

r^-1 = 1/20

-1 < 0

1/(r^1) = 1/20 // * r^1

1 = 1/20*r^1 // : 1/20

20 = r^1

r = 20

r = 20

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