To solve this equation, we first need to find a common denominator for the fractions on the right side of the equation. The common denominator for 8 and 3 is 24.

So, the equation becomes:

(16/24) - (21/24)x = 8/24

Now, we can combine the fractions:

(16 - 21x) / 24 = 8 / 24

Now, we can simplify the equation:

16 - 21x = 8

Subtract 16 from both sides:

-21x = -8

Divide by -21:

x = 8 / 21

Therefore, the solution to the equation is x = 8 / 21.