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:

x1=1
x2=3
x3=1



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