1-13 / 14 × 7 / 9-2 / 9 △ 14 / 13 (simple calculation)

1－13/14×7/9－2/9÷14/13
=1－13/14×7/9－2/9x13/14
=1-13/14x（7/9+2/9）
=1-13/14
=1/14

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