Respuesta :

The solution to the proportion X is 30.

cambeachlife

Answer:

x = 30

Step-by-step explanation:

D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

4/12 = 10/x // - 10/x

4/12-(10/x) = 0

4/12-10*x^-1 = 0

-10*x^-1 = -1/3 // : -10

x^-1 = 1/30

-1 < 0

1/(x^1) = 1/30 // * x^1

1 = 1/30*x^1 // : 1/30

30 = x^1

x = 30

x = 30