72/80-(х-12/80)=15/80
х-12/80=72/80-15/80
х-12/80=57/80
х=57/80+12/80
х=69/80
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72/80-(х-12/80)=15/80
х-12/80=72/80-15/80
х-12/80=57/80
х=57/80+12/80
х=69/80