Ответ:-1/6
y+5/7-1/8=2/3-1/4
y+40/56-7/56=8/12-3/12
y+33/56=5/12
y=5/12-33/56
y=70/168-99/168
y=-28/168
y=-1/6
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Ответ:-1/6
y+5/7-1/8=2/3-1/4
y+40/56-7/56=8/12-3/12
y+33/56=5/12
y=5/12-33/56
y=70/168-99/168
y=-28/168
y=-1/6