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D( x )
3*x+12/12 = 0
3*x+12/12 = 0
3*x+12/12 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:+oo)
(2*x+8/15)/(3*x+12/12) = 0
(2*x+8/15)/(3*x+1) = 0
2*x+8/15 = 0 // - 8/15
2*x = -8/15 // : 2
x = -8/15/2
x = -4/15
x = -4/15
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