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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/x = -4.5 // + 4.5
36/x+4.5 = 0
36*x^-1 = -4.5 // : 36
x^-1 = -0.125
-1 < 0
1/(x^1) = -0.125 // * x^1
1 = -0.125*x^1 // : -0.125
-8 = x^1
x = -8
x = -8
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