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.