Roots count

Substitute the numbers/0,1,2,3/into the equation as x:
(x - 1) (x - 3) (x + 1) = 0

Which of them is its solution?
Is there another number that solves this equation?

Correct result:

x₁ =  1
x₂ =  3
x₃ =  -1

Solution:

$x_1=1$

$x_2=3$

$x_3=-1$

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