Х-1 18/81=6 15/81-3 20/81
Х-1 18/81=2 76/81
Х=4 13/81
x-1 • 18/81=6 • 15/81-3 • 20/81
x-1 • 18/81=2 • 76/81
x=4 • 13/81
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Х-1 18/81=6 15/81-3 20/81
Х-1 18/81=2 76/81
Х=4 13/81
x-1 • 18/81=6 • 15/81-3 • 20/81
x-1 • 18/81=2 • 76/81
x=4 • 13/81