((3x-9)/(5))/((5x-15)/(7))

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Solution for ((3x-9)/(5))/((5x-15)/(7)) equation: 


D( x )

(5*x-15)/7 = 0

(5*x-15)/7 = 0

(5*x-15)/7 = 0

5*x-15 = 0 // + 15

5*x = 15 // : 5

x = 15/5

x = 3

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

((3*x-9)/5)/((5*x-15)/7) = 0

(7*(3*x-9))/(5*(5*x-15)) = 0

3*x-9 = 0 // + 9

3*x = 9 // : 3

x = 9/3

x = 3

x in { 3} 

x belongs to the empty set

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