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Efectuati:24+17-18-9+m=91

Răspuns :

24+17-18-9+m=91
31-18-9+m=91
4+m=91
m=91-4
m=87
24+17-18-9+m=91
41- 9+m=91
32+m=91
deci:
m=91-32
m=59