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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x+8/x-3 = 14 // - 14
12/x+8/x-14-3 = 0
20*x^-1 = 17 // : 20
x^-1 = 17/20
-1 < 0
1/(x^1) = 17/20 // * x^1
1 = 17/20*x^1 // : 17/20
20/17 = x^1
x = 20/17
x = 20/17
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