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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (10/7)*(2/x)-6 // - (10/7)*(2/x)-6
y-((10/7)*(2/x))+6 = 0
(-20/7)*x^-1+y+6 = 0
-20/7*x^-1 = -(y+6) // : -20/7
x^-1 = 7/20*(y+6)
-1 < 0
1/(x^1) = 7/20*(y+6) // * x^1
1 = 7/20*x^1*(y+6) // : 7/20*(y+6)
20/7*(y+6)^-1 = x^1
x = 20/7*(y+6)^-1
x = 20/7*(y+6)^-1
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