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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x+3/x+6 = 0
10*x^-1 = -6 // : 10
x^-1 = -3/5
-1 < 0
1/(x^1) = -3/5 // * x^1
1 = -3/5*x^1 // : -3/5
-5/3 = x^1
x = -5/3
x = -5/3
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