Răspuns :

n • 7+7-7=11 • 7
n • 7+7-7=77
n• 7+7=77+7
n •7+7=84
n•7=84-7
n•7=77
n=77:7
n=11

Răspuns:

n × 7+7-7=11 × 7

n × 7+7-7=77

n × 7+7=77+7

n × 7+7=84

n × 7=84-7

n × 7=77

n=77:7

n=11

Pls coroana ca am nevoie