(0,9-r)/r=1

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Solution for (0,9-r)/r=1 equation: 


D( r )

r = 0

r = 0

r = 0

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

(0.9-r)/r = 1 // - 1

(0.9-r)/r-1 = 0

(0.9-r)/r+(-1*r)/r = 0

0.9-r-1*r = 0

0.9-2*r = 0

(0.9-2*r)/r = 0

(0.9-2*r)/r = 0 // * r

0.9-2*r = 0

0.9-2*r = 0 // - 0.9

-2*r = -0.9 // : -2

r = -0.9/(-2)

r = 0.45

r = 0.45

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