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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*432)/x+(144*x)/x+3 = 0
1296*x^-1 = -147 // : 1296
x^-1 = -49/432
-1 < 0
1/(x^1) = -49/432 // * x^1
1 = -49/432*x^1 // : -49/432
-432/49 = x^1
x = -432/49
x = -432/49
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