Answer:
n-20
--------
3a
Explanation:
(3ax - n)/5 = -4
The first step is to multiply each side by 5 to get rid of the fraction
(3ax - n)/5 * 5= -4* 5
3ax - n = -20
Then we need to add n to each side.
3ax -n+n = -20+n
3ax = n-20
Divide each side by 3a to isolate x
3ax/3a = (n-20)/3a
x = (n-20)/(3a)