The answer is 17 over 12.
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3 4/7 minus 1/7 is 3 3/7
21/3 * 1/4 = 7/3 * 1/4 = 7/12
(-3/4)*(-1/3) + (7/8)*(-1/2) = (3/4)*(1/3) - (7/8)*(1/2) = 1/4 - 7/16 = 4/16 - 7/16 = -3/16
28/9 x 4/7 = 1 and 7/9
That depends on whether you are asking about (4/7)-1 or 4/(7-1) (whether the one is in the denominator or is a separate thing. (4/7)-1 is -3/7 4/(7-1)=4/6=2/3