(-2r-9)/(8r-10)

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Solution for (-2r-9)/(8r-10) equation: 


D( r )

8*r-10 = 0

8*r-10 = 0

8*r-10 = 0

8*r-10 = 0 // + 10

8*r = 10 // : 8

r = 10/8

r = 5/4

r in (-oo:5/4) U (5/4:+oo)

(-2*r-9)/(8*r-10) = 0

-2*r-9 = 0 // + 9

-2*r = 9 // : -2

r = 9/(-2)

r = -9/2

r = -9/2

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