6 1\7 - c - 2 4/7 = 2 5/7
c = 6 1/7 - 2 4/7 - 2 5/7
c = 6 1/7 - 4 9/7
c = 43/7 - 37/7
c = 6/7
c = 6 1/7 - 2 4/7 - 2 5/7
c = 6 1/7 - 4 9/7
c = 43/7 - 37/7
c = 6/7
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