Divide -81 by the sum of 3/5 and -6/7.
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3/5 + -6/7
3×7+5×-6/5×7
21-30/35
-9/35
-0.25
-0.25/-81=0.003
3×7+5×-6/5×7
21-30/35
-9/35
-0.25
-0.25/-81=0.003
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