book Maths Puzzle Numerical Ability

3x+4=10

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book Other Question

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?!
my question is how would I solve this equation 34% of 250 =