The result of -7 minus 1 is -8. When subtracting a positive number from a negative number, you essentially add the two numbers together with the negative sign. In this case, -7 plus (-1) equals -8.
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7/12 minus 1/3 = 1/4
3 4/7 minus 1/7 is 3 3/7
7/20 minus 1/42 = 137/420
4 1/7 minus 2 6/7 = 1 2/7
7/8 minus 1/6 is 17/24.