(13 / 4-17 / 9) × 9 / 7

(13 / 4-17 / 9) × 9 / 7
=[1+9/4-(1+8/9)]*9/7
=[9/4-8/9]*9/7
=9/4*9/7-8/9*9/7
=81/28-8/7
=81/28-32/28
=49/28
=7/4

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