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10 cards from this deck
It measures the distance from zero, always non-negative.
A number that, when squared, gives the original number.
The inequality sign reverses direction.
Only non-negative numbers to avoid undefined results.
Form two inequalities: x < 4 and x > -4.
It must be done carefully to avoid mistakes.
Omitting domain checks can lead to errors.
Sketch graphs and find intersection points.
Analyzing different cases for |x| < b.
Always check the domain to avoid invalid solutions.
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