book Maths Puzzle Numerical Ability

3479(65)-5x=6789

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book Other Question

how do you solve this problem : 2e and then in the exponent log base 3 (x +2) = 14? Solve for :

x^2-100/x^2+12x+20 times x^2+20x+100/x-10 = 18x+99/x+2

This is a real headache I can not figure it out