book Maths Puzzle Numerical Ability

Please help me solve this problem. I don't understand how to get the answer.

-5w - 2 + w - 1 / 3 - w - 3w + 4w - 1 + w / 9

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book Other Question

In the period of a year, an investor lost twica as much as he gained. If he originally had $10,000and now has $20,000, what amount did he gain and what did he lose? A banker invested $24,000 for a client in two mutual funds, one earning 9% annuaul interest and the other earning 14%. After on year, the total interest earned was $3135. How much