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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+7/x-5+7 = 0
13*x^-1 = -2 // : 13
x^-1 = -2/13
-1 < 0
1/(x^1) = -2/13 // * x^1
1 = -2/13*x^1 // : -2/13
-13/2 = x^1
x = -13/2
x = -13/2
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