book Maths Puzzle Numerical Ability

Perform the indicated operation and express your answer in simplest form:

(4/x)-(3x+3/x^2+1x)+(x/x+1)

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Now I have the problem. I just want to check this one.

-6-(-7)-15-(-12)=?

We are coming up with -2. Is this correct?

Thanks,
Jeff give an example of a function that has many values in the domain and only one element in the range.