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(x^2-(2*x))/20 = 0
(x^2-2*x)/20 = 0
x^2-2*x = 0
x*(x-2) = 0
x-2 = 0 // + 2
x = 2
x*(x-2) = 0
(x*(x-2))/20 = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x )
x = 0
x in { 2, 0 }
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