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