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Afla necunoscută repede dau coroană
[675-126×3+(426×3+108×c):2]:4×6=714


Răspuns :

[675-378+(1278+108×c):2]:4=119

297+(1278+108×c):2=476

(1278+108×c):2=179

1278+108×c=358

108×c=-920

c=-8.51