This is the first derivative from a quartic, I'm just trying to find the min and max

0.36x^3 - 0.84x^2 +5.52x - 6.84 = 0

I thought about making them all fractions? Like:

9x^3/25 - 21x^2/25 +138x/25 - 171/25 = 0

but I wasn't sure how to work it out from there

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