y=3/(7-x)

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Solution for y=3/(7-x) equation: 


D( x )

7-x = 0

7-x = 0

7-x = 0

7-x = 0 // - 7

-x = -7 // * -1

x = 7

x in (-oo:7) U (7:+oo)

y = 3/(7-x) // - 3/(7-x)

y-(3/(7-x)) = 0

y-3*(7-x)^-1 = 0

y-3/(7-x) = 0

(y*(7-x))/(7-x)-3/(7-x) = 0

y*(7-x)-3 = 0

7*y-(x*y)-3 = 0

(7*y-(x*y)-3)/(7-x) = 0

(7*y-(x*y)-3)/(7-x) = 0 // * 7-x

7*y-(x*y)-3 = 0

x*(-y)+7*y-3 = 0 // - 7*y-3

x*(-y) = -(7*y-3) // : -y

x = (-(7*y-3))/(-y)

x = -(y^-1*(3-(7*y)))

x = -(y^-1*(3-(7*y)))

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