book Maths Puzzle Numerical Ability

(5/x)+(9/9x)=3

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book Other Question

Can someone please help find the LCM
(x-1)^3(x+1); (x-1)(x+1);(x-1)^2(x+1)^2

Thanks for your help.
Problem goes like this...

Solve Equation.

log2 (5x+7) - log2 x = 2