exam Maths Puzzle Numerical Ability

(6/x-5)-(1/3x-15)+(4/5-x) simplify and reduce, I got -5/(3)(-1)(x-5)

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The amount of ozone in the atmosphere is decreasing by 0.25%annually. If this rate of decrease continues, after how many years will 82.9% of today's ozone remain? Find the horizontal asymptote of F(x) =5x^2+1/ x^2+2x+1