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Calculator Output

Simplifying
21k + -98k2 + -343k3

Factor out the Greatest Common Factor (GCF), '7k'.
7k(3 + -14k + -49k2)

Factor a trinomial.
7k((1 + -7k)(3 + 7k))

Final result:
7k(1 + -7k)(3 + 7k)
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