Răspuns :

Crystynel2013id
A : 6 * 9 : 7* 7 = 63 
A : 6 * 9 :7 = 9
A : 6*9 = 63 
A : 6 = 7 
A = 42
Alexandratoma3id
a:6x9:7x7=32+32-9:9
a:6x9:7x7=64-1
a:6x9:7x7=63
6a=63:9x7:7
6a=7x7:7
6a=49:7
6a=7
a=6x7
a=42

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