3/4+(n*1,5)=120%+1/2=

3/4+(n*1,5)=120%+1/2
3/4 + (n * 1,5)= 120/100 + 1/2
3/4 + (n * 1,5) = 12/10 + 5/10
3/4 + (n * 1,5) = 17/10
 (n * 1,5) = 28/20 - 15/20
1,5 n = 13/20
n= 13/20 : 3/2
n = 13/20 x 2/3
n= 26/60
n= 13/30