book Maths Puzzle Numerical Ability

4/x^2 + 3/x -10 = 0

6 + 4/x-1 = 5/x-3

3.5x + 4.6/x = 1.2

Can anyone help me?!

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book Other Question

Prove that (2x-1)^(1/4)= -1 has no solution at all what is the cardinal number for this set
(1,3,5,.....1001)
(1,2,4,8,....1024)