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