book Maths Puzzle Numerical Ability

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

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book Other Question

Please help me with this word problem.

1. A house was bought for $50,000 and was sold 15 years later for $95,000. Find the effective yield.

Thank you very much Solve x/2x-1=> 3/x+2
Rational inequality
Thank you!!