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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-(12/x) = 7 // - 7
4-(12/x)-7 = 0
4-12*x^-1-7 = 0
-12*x^-1 = 3 // : -12
x^-1 = -1/4
-1 < 0
1/(x^1) = -1/4 // * x^1
1 = -1/4*x^1 // : -1/4
-4 = x^1
x = -4
x = -4
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