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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y-(3/x)-4 = 10 // - 10
Y-(3/x)-10-4 = 0
Y-3*x^-1-10-4 = 0
-3*x^-1 = -(Y-14) // : -3
x^-1 = (14-Y)/(-3)
-1 < 0
1/(x^1) = (14-Y)/(-3) // * x^1
1 = x^1*((14-Y)/(-3)) // : (14-Y)/(-3)
-3*(14-Y)^-1 = x^1
x = -3*(14-Y)^-1
x = -3*(14-Y)^-1
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