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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-2 = 7/4 // - 7/4
6/x-(7/4)-2 = 0
6/x-7/4-2 = 0
6*x^-1 = 15/4 // : 6
x^-1 = 5/8
-1 < 0
1/(x^1) = 5/8 // * x^1
1 = 5/8*x^1 // : 5/8
8/5 = x^1
x = 8/5
x = 8/5
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