The soil samples for the next field indicate that fertilizer coverage needs to be greater

What numbers are included in the set of integers? what numbers are not included?

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

Plz hurry evaluate the expression a+b where a=8 and b=19