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128-[47+6*7-(x:3+15)]:3=104

Răspuns :

[47+42-(x:3+15)]:3=128-104
47+42-(x:3+15):3=24
47+42-(x:3+15)=24*3
47+42-(x:3+15)=72
42-(x:3+15)=72-47
42-(x:3+15)=25
x:3+15=42-25
x:3+15=17
x:3=17-15
x:3=2
x=2*3
x=6