Ответы на вопрос:
10/3: (3/7x-13/15)=25/16 10/3: 25/16=3/7x-13/15 10/3*16/25=3*15x/105 - 13*7/105 32/15=45x-91/105 15*(45x-91)=32*105 45x-91=32*7 45x-91=224 45x=315 x=7
31/3: (3/7x-13/15)=1 9/16 3/7x-13/15=3 1/3: 1 9/16 10/3: 25/16=10/3*16/25=32/15 3/7x-13/15=32/15 3/7x=32/15+13/15 3/7x=45/15=3 x=3: 3/7 3: 3/7=3*7/3=7 x=7
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