book Maths Puzzle Numerical Ability

Simplify the expression:

1/x-1/b over 1/xb+1/2

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book Other Question
i thought it was 4/14 but i was wrong...Which of the following is not a fractional representation for 2/7..




6/21

4/14


8/18


4/21

 x+1/3 - x-1/2 = 1