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[6+(t-9)x18+24]:2=24aflati t

Răspuns :

6+(t-9)×18+24=24×2
6+(t-9)×18+24=48
(t-9)×18+24=48-6
=42
(t-9)×18=42-24
=18
t-9=18:18
t-9=1
t=1+9
t=10