exam Maths Puzzle Numerical Ability

HOW WOULD I SIMPLIFY THIS EXPRESSION

1/y - 1/y-3

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exam Other Question

The difference of 2 numbers is 4. The difference between their reciprocals is 4/21. Find the 2 numbers Tutors..PLEASE help ME!!!!

Solve the exponential equation:

3^x2+4x=1/27

and

28^x=10^-3x