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3x3 + 15x2 + 18x = 0

This has one obvious solution, x = 0. Also, if you assume x != 0 (x is not equal to 0), and divide everything by 3x:

x2 + 5x + 6 = 0

can be factored to

(x + 2)(x + 3) = 0

So, two other solutions are x = -2, and x = -3.

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