Mister Exam

-(t-9)(t-12)(t-15) canonical form

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The solution

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(-15 + t)*(-12 + t)*(9 - t) = 0
$$\left(9 - t\right) \left(t - 15\right) \left(t - 12\right) = 0$$
(9 - t)*(t - 15)*(t - 12) = 0