y=4/(3-x)

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Solution for y=4/(3-x) equation: 


D( x )

3-x = 0

3-x = 0

3-x = 0

3-x = 0 // - 3

-x = -3 // * -1

x = 3

x in (-oo:3) U (3:+oo)

y = 4/(3-x) // - 4/(3-x)

y-(4/(3-x)) = 0

y-4*(3-x)^-1 = 0

y-4/(3-x) = 0

(y*(3-x))/(3-x)-4/(3-x) = 0

y*(3-x)-4 = 0

3*y-(x*y)-4 = 0

(3*y-(x*y)-4)/(3-x) = 0

(3*y-(x*y)-4)/(3-x) = 0 // * 3-x

3*y-(x*y)-4 = 0

x*(-y)+3*y-4 = 0 // - 3*y-4

x*(-y) = -(3*y-4) // : -y

x = (-(3*y-4))/(-y)

x = -(y^-1*(4-(3*y)))

x = -(y^-1*(4-(3*y)))

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