#### Answer

{$24$}

#### Work Step by Step

First, we add the two fractions on the left hand side of the equation by finding the LCM of the denominators of the two fractions. Upon observation, we find that the LCM of the two denominators is 24. Then we cross multiply the resultant fractional equation and simplify.
Step 1: $\frac{x}{8}-\frac{x}{6}=-1$
Step 2: $\frac{3x-4x}{24}=-1$
Step 3: $\frac{-x}{24}=-1$
Step 4: $-x=-1(24)$
Step 5: $-x=-24$
Step 6: $x=24$
Therefore, the solution set is {$24$}.