Question 893094
Rule: If |x| < k for some positive number k, then  {{{-k < x < k}}}


That's the same as saying {{{x < k}}} and {{{x > -k}}} (I don't recommend this way because it's a bit clunky compared to the first method)


So that's why  |W| < 25 turns into <font color="red">W < 25 and W > -25</font>