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D( x )
4*x-32 = 0
4*x-32 = 0
4*x-32 = 0
4*x-32 = 0 // + 32
4*x = 32 // : 4
x = 32/4
x = 8
x in (-oo:8) U (8:+oo)
(5*x-50)/(4*x-32) = 0
5*x-50 = 0 // + 50
5*x = 50 // : 5
x = 50/5
x = 10
x = 10
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