1/7-3/7 = -2/7.

1/7 - 3/7 = (?)

1/7 - 3/7 = (1 - 3)/7

= -2/7

1/7 - 3/7 = -2/7

1/7 is a fraction as a minuend,

3/7 is a fraction as a subtrahend,

-2/7 is the difference between 1/7 and 3/7.

1/7 - 3/7 = -2/7

-2/7 = -0.2857

1/7-3/7 as a decimal is -0.2857

-0.2857 is the difference between 1/7 and 3/7.