book Maths Puzzle Numerical Ability

add or subtract,simplify if possible and show steps to answer

16+X/x^3 + 7-4X/X^3

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book Other Question

Solve each inequality. Give the solution set in both interval and graph forms.
I am lost in this I was able to work one problem 4-6x+3>1 -- I did it but then I came to this one wi log(10x/y)=1+log x-log y. I have no idea whether this problem is true or false. Could you please help show me the steps in finding the answer?