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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/y = 16/x // - 16/x
12/y-(16/x) = 0
12/y-16*x^-1 = 0
-16*x^-1 = -(12*y^-1) // : -16
x^-1 = (3*y^-1)/4
-1 < 0
1/(x^1) = (3*y^-1)/4 // * x^1
1 = x^1*((3*y^-1)/4) // : (3*y^-1)/4
(4*y)/3 = x^1
x = (4*y)/3
x = (4*y)/3
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