book Maths Puzzle Numerical Ability

solve:

20 over x = 20 over x-4 + 4 over x

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book Other Question

the denominator of a fraction is 1 more then the numerator. If the numerator is decreased by 1, the value of the resulting fraction is 3/4. What is the original fraction? 3x2 +x -2 =0

I only need to solve this using QF and don't need to find the discriminant.