n/2 - 2n/16 = 3/8 it's basic algebra.
Step 1 :
n/2 = 8n/16 multiply both numerator and denominator by 8.
3/8 = 6/16 multiply both numerator and denominator by 2.
Step 2 : we can add the fractions since now they have the same denominator
8n/16 -2n/16 = 6/16
(8n - 2n -6)/16 = 0
(6n - 6)/16 = 0
6n - 6 = 0
6n = 6
n = 6/6 = 1 This is the n value
Answer n = 1
Hope this helps!