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\frac{15}{4}x^{3}+\frac{4}{3}x^{2}-\frac{7}{5}x+\frac{1}{7}-\frac{4}{5}x^{2}-\frac{6}{7}x-5
Combine \frac{3}{2}x^{3} and \frac{9}{4}x^{3} to get \frac{15}{4}x^{3}.
\frac{15}{4}x^{3}+\frac{8}{15}x^{2}-\frac{7}{5}x+\frac{1}{7}-\frac{6}{7}x-5
Combine \frac{4}{3}x^{2} and -\frac{4}{5}x^{2} to get \frac{8}{15}x^{2}.
\frac{15}{4}x^{3}+\frac{8}{15}x^{2}-\frac{79}{35}x+\frac{1}{7}-5
Combine -\frac{7}{5}x and -\frac{6}{7}x to get -\frac{79}{35}x.
\frac{15}{4}x^{3}+\frac{8}{15}x^{2}-\frac{79}{35}x-\frac{34}{7}
Subtract 5 from \frac{1}{7} to get -\frac{34}{7}.
\frac{1575x^{3}+224x^{2}-948x-2040}{420}
Factor out \frac{1}{420}. Polynomial 1575x^{3}+224x^{2}-948x-2040 is not factored since it does not have any rational roots.