(x+3)/(x-3)=20

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Solution for (x+3)/(x-3)=20 equation: 


D( x )

x-3 = 0

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

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

(x+3)/(x-3) = 20 // - 20

(x+3)/(x-3)-20 = 0

(x+3)/(x-3)+(-20*(x-3))/(x-3) = 0

x-20*(x-3)+3 = 0

63-19*x = 0

(63-19*x)/(x-3) = 0

(63-19*x)/(x-3) = 0 // * x-3

63-19*x = 0

63-19*x = 0 // - 63

-19*x = -63 // : -19

x = -63/(-19)

x = 63/19

x = 63/19

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