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Math · Advanced Math · Saturday, October 31, 2026

For negative x, |x| = -x, so x + |x| = 0.

In short

On Digital SAT Math questions about advanced math, for negative x, |x| = -x, so x + |x| = 0.

For negative $x$, $|x| = -x$, so $x + |x| = 0$.