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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(7/x)-50 = 0
X^2-7*x^-1-50 = 0
-7*x^-1 = -(X^2-50) // : -7
x^-1 = (50-X^2)/(-7)
-1 < 0
1/(x^1) = (50-X^2)/(-7) // * x^1
1 = x^1*((50-X^2)/(-7)) // : (50-X^2)/(-7)
-7*(50-X^2)^-1 = x^1
x = -7*(50-X^2)^-1
x = -7*(50-X^2)^-1
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