book Maths Puzzle Numerical Ability

please solve and show process for:
2/7x-1/2x=3/4x+1

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book Other Question

I am not sure how to solve this one

ln (square root of x +4) =1

and

log base 2 (x-3) + log base 2x - log base 2 (x+2) =2 a markup rate of 40% was used on a basketball with a selling price of $82.60. find the cost of the basketball.