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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x+240 = 0
8*x^-1 = -240 // : 8
x^-1 = -30
-1 < 0
1/(x^1) = -30 // * x^1
1 = -30*x^1 // : -30
-1/30 = x^1
x = -1/30
x = -1/30
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