-3 1/2n + 3/4 = 5 1/60 change to improper fractions first
-3 1/2n = -(6n +1)/2n
3/4 = 3/4 get into 60th = 45/60
5 1/60 = 301/60
rewrite the equation:
-(6n + 1)/2n + 45/60 = 301/60
-(6n+1)/2n = 256/60 reduce
-(6n+1)/2n = 128/30
-(6n+1)/2n = 64/15 cross multiply
-(6n+1)* 15 = 2n*64
-90n -15 = 128
-90n = 113
n = -113/90
n = -1 23/90