Ответ:
72/80-(x-12/80)=15/80
x-12/80=72/80-15/80
x-12/80=57/80
x=12/80+57/80
x=69/80
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Ответ:
72/80-(x-12/80)=15/80
x-12/80=72/80-15/80
x-12/80=57/80
x=12/80+57/80
x=69/80