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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-7/x-(x/x)+2+3 = 0
2-7/x-1+2+3 = 0
-7*x^-1 = -6 // : -7
x^-1 = 6/7
-1 < 0
1/(x^1) = 6/7 // * x^1
1 = 6/7*x^1 // : 6/7
7/6 = x^1
x = 7/6
x = 7/6
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