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Debleadaniel
a fost răspuns

9×7+a-8×5=40

7×6+a-3×7=23
A+:8+(6:6-32:8)=7
30:5:a=2

Răspuns :

63+a-40=40
a=80-63
a=17

42+a-21=23
a=23+21-42
a=2

30:5:a=2
a=30/5/2
a=3

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