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((1/2)*x-4)*(2*x-8) = 0
(1/2*x-4)*(2*x-8) = 0
( 1/2*x-4 )
1/2*x-4 = 0 // + 4
1/2*x = 4 // : 1/2
x = 4/1/2
x = 8
( 2*x-8 )
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x in { 8, 4 }
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