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1000-[5+2×(100+y×4)-124:4]=754

Răspuns :

5+2×(100+y×4)-124:4=1000-754
5+2×(100+y×4)-31=246
5+2×(100+y×4)=277
2×(100+y×4)=272
100+y×4=272:2
100+y×4=136
y×4=136-100
y×4=36
y=36:4
y=9