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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
92-(12/x) = -75 // + 75
75-(12/x)+92 = 0
75-12*x^-1+92 = 0
-12*x^-1 = -167 // : -12
x^-1 = 167/12
-1 < 0
1/(x^1) = 167/12 // * x^1
1 = 167/12*x^1 // : 167/12
12/167 = x^1
x = 12/167
x = 12/167
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