Yes, -5/7 is a rational number because it can be expressed as a fraction.
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-7/8 < -5/6 (a+)
The sum of -3/5 and 1/7 is -16/35
1.40
-(1/4) + (5/7) = 0.464285714
If the decimal number can be expressed as a fraction (with one whole number over another), then it is a rational decimal number. So 7/5 is a rational number, and remains as such even if expressed in decimal form (of 1.4).