An equation of the third degree has the form:
To solve this equation we use the following substitution:
Then we have:
The roots of this equation are:
1. If Δ < 0: The equation has 3 distinct real roots (solutions).
2. If Δ = 0: The equation has three real roots, of which at least two are the same.
3. If Δ > 0: The equation has only one real root and two complex roots, combined.
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