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0+[(1+2*3):c]:6=(78-69):9

Răspuns :

0+[(1+2×3):c]=(78-69):9
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0+(1+6:c)=9:9
0+5:c=1
5:c=1
c=1×5
c=5
Verificare:0+[(1+2×3):5]=(78-69):9