book Maths Puzzle Numerical Ability

Solve the equation. Beware of extraneous solutions.
((15x/9)/x)+ ((9x+7/(x+2))= 9

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book Other Question

A project has an initial outlay of $4.000. It has a single payoff at the end of year 4 of $6,996.46. What is the internal rate of return for the project. How do i solve this multi-step equation?

4 + x -2(x-6)= 8