-3/7 × 5/12 + 11/12 × -3/7
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-3/7 × 5/12 + 11/12 × -3/7
= -3/7 × ( 5/12 + 11/12 )
= -3/7 × 5+11 / 12
= -3/7 × 16/12
= -3/7 × 4/3
= -12 / 21
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