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= 3/5 × {[(7/3 + 1/2) - (2/3 - 1/4)] ÷ [ 1/3 - 12/5 × 10/15]}
= 3/5 × {[ 17/6 - 5/12] ÷ [ 1/3 - 8/5 ]}
= 3/5 × { 29/12 ÷ -19/15
= 3/5 × -145/76
= - 87/76
Suerte.