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Am nevoie de ajutor! (56:a+16) :5+9=13

Răspuns :

(56:a+16):5=13-9
56:a+16=4x5
56:a=20-16
a=56:4
a=14
(56:a+16):5  =13-9
=(56:a+16)::5=4
=56:a+16) =4x5
=56:a+16  =20
=56:a       =20-16
=56::a       =4
        a       =56:4
         a      =14