Answer:
convert -6 4/7 into an improper fraction: (-6*7 -4)/7 = -46/7
convert 3 2/7 into an improper fraction: (3*7 +2)/7 = 23/7
sum of -6 4/7 + 3 2/7 = -46/7+23/7 = -23/7 or -3 2/7
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