How does one find the roots of an equation, for instance:(adsbygoogle = window.adsbygoogle || []).push({});

r^4 + r^3 - 7r^2 - r + 6 = 0

...completely by hand. Is there some type of non-lengthy process or trick to find special circumstances for easy solving? Thanks.

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# Solving cubic or higher degree polynomials by hand

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