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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+6 = -45 // + 45
3/x+6+45 = 0
3*x^-1 = -51 // : 3
x^-1 = -17
-1 < 0
1/(x^1) = -17 // * x^1
1 = -17*x^1 // : -17
-1/17 = x^1
x = -1/17
x = -1/17
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