9/r+8

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Solution for 9/r+8 equation: 


D( r )

r = 0

r = 0

r = 0

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

9/r+8 = 0

9*r^-1 = -8 // : 9

r^-1 = -8/9

-1 < 0

1/(r^1) = -8/9 // * r^1

1 = -8/9*r^1 // : -8/9

-9/8 = r^1

r = -9/8

r = -9/8

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