Respuesta :

Answer:

12

Step-by-step explanation:

x - [tex]3\frac{1}{2}[/tex] = 8.5          

x - [tex]\frac{7}{2}[/tex] = 8.5         Convert the mixed fraction to a imroper fraction.

x - 3.5 = 8.5     Convert the improper fraction to a decimal number.

x = 12                Add 3.5 to both sides.