4,3/7 + (-8,9/14)= 4,6/14+(-8,9/14)= ( 8,9/14-4,6/14)= -4,3/14
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4,3/7 + (-8,9/14)= 4,6/14+(-8,9/14)= ( 8,9/14-4,6/14)= -4,3/14