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(x^2-(4*x))/4 = 0
(x^2-4*x)/4 = 0
x^2-4*x = 0
x*(x-4) = 0
x-4 = 0 // + 4
x = 4
x*(x-4) = 0
(x*(x-4))/4 = 0
( x-4 )
x-4 = 0 // + 4
x = 4
( x )
x = 0
x in { 4, 0 }
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