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D( x )
16*x-9 = 0
16*x-9 = 0
16*x-9 = 0
16*x-9 = 0 // + 9
16*x = 9 // : 16
x = 9/16
x in (-oo:9/16) U (9/16:+oo)
(310*x)/(16*x-9) = 0
310*x = 0 // : 310
x = 0
x = 0
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