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7-21:(30:5:2)=a-(48:6)ori5

Răspuns :

7 - 21 : (30 : 5 : 2) = a - (48 : 6) * 5
7 - 21 : 3 = a - 8 * 5
7 - 7 = a - 40
- a = - 40
a = 40