Răspuns :
100•[25-5•(x-3)+2]:4=300
25•[25-5•(x-3)+2]=
27-5•(x-3)=12
-5•(x-3)=12-27
5•(x-3)=15
x-3=3
x=6
25•[25-5•(x-3)+2]=
27-5•(x-3)=12
-5•(x-3)=12-27
5•(x-3)=15
x-3=3
x=6