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100•[25-5•(x-3)+2]:4=300


Răspuns :

100*[25-5x+15+2]:4=300
(25-5x+17):4=3
25-5x+17=12
42-5x=12
5x=30
x=6
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