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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-3 = -7/x-7 // + -7/x-7
7/x-(-7/x)-3+7 = 0
7/x+7*x^-1-3+7 = 0
14*x^-1 = -4 // : 14
x^-1 = -2/7
-1 < 0
1/(x^1) = -2/7 // * x^1
1 = -2/7*x^1 // : -2/7
-7/2 = x^1
x = -7/2
x = -7/2
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