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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x+5/4+3 = 0
15*x^-1 = -17/4 // : 15
x^-1 = -17/60
-1 < 0
1/(x^1) = -17/60 // * x^1
1 = -17/60*x^1 // : -17/60
-60/17 = x^1
x = -60/17
x = -60/17
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