a) (-3/4 - 4/7) : 5/4 b) 1/3 x -5/7 + 1/3 x -4/7 c) 3/8 : 15/7 - (-5/8) :15/7

a) (-3/4 - 4/7) : 5/4 b) 1/3 x -5/7 + 1/3 x -4/7 c) 3/8 : 15/7 - (-5/8) :15/7
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