book Maths Puzzle Numerical Ability

I cannot figure out the solution to what number makes the absolute value of x equal to the negative absolute value of x?
Please help.

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book Other Question

The executive committee of the student government consists of 10 members. In how many ways can a subcommittee of 3 members be chosen? Thank you for your help. I am not sure if this is a quadratic equation question or not but here goes.

(1/w)+(1/(w-1))=(1/(w-w^2))

I am stumped. I think the answer is W=-1 but I have also gotten W=1