y=9/(8-x)

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Solution for y=9/(8-x) equation: 


D( x )

8-x = 0

8-x = 0

8-x = 0

8-x = 0 // - 8

-x = -8 // * -1

x = 8

x in (-oo:8) U (8:+oo)

y = 9/(8-x) // - 9/(8-x)

y-(9/(8-x)) = 0

y-9*(8-x)^-1 = 0

y-9/(8-x) = 0

(y*(8-x))/(8-x)-9/(8-x) = 0

y*(8-x)-9 = 0

8*y-(x*y)-9 = 0

(8*y-(x*y)-9)/(8-x) = 0

(8*y-(x*y)-9)/(8-x) = 0 // * 8-x

8*y-(x*y)-9 = 0

x*(-y)+8*y-9 = 0 // - 8*y-9

x*(-y) = -(8*y-9) // : -y

x = (-(8*y-9))/(-y)

x = -(y^-1*(9-(8*y)))

x = -(y^-1*(9-(8*y)))

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