Book Maths Puzzle Algebra

Solve for x e^(2In(2x)) = 4

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Book Other Question

Find x: logx(4x-3)=2 (i got X=1.25? I can't get my head around these) 1. In 1978, a kg of paper was sold at Rs25/-. If the paper rate increases at 1.5% more than the inflation rate which is 6.5% a year, then what will be the cost of a kg of paper after 2 years?