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D( x )
8*x+16 = 0
8*x+16 = 0
8*x+16 = 0
8*x+16 = 0 // - 16
8*x = -16 // : 8
x = -16/8
x = -2
x in (-oo:-2) U (-2:+oo)
(12*x+16)/(8*x+16) = 0
12*x+16 = 0 // - 16
12*x = -16 // : 12
x = -16/12
x = -4/3
x = -4/3
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