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

express as the same function of a positive acute angle of csc 101 degrees not using a calculator. The square of 9 more than a number is equal to 9 more than the square of the number. What is the number?
thanx