Answer:
Refer to explanation^
Explanation:
As stated in the solution, 3/7 is a negative fraction. 
To make it less confusing, 
2/7 x (-3/7)
Multiply the numerator with the other numerator and the denominator multiply with the other. Like... 
2 multiply 3 = 6 (numerator) 
7 multiply 7 = 49 (denominator) 
Since the 2nd fraction is a negative, the answer is negative too. 
If you convert the fraction to a decimal, it gives -0.1224489796