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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 8/y // - 8/y
12/x-(8/y) = 0
12/x-8*y^-1 = 0
12*x^-1 = -(-8*y^-1) // : 12
x^-1 = (2*y^-1)/3
-1 < 0
1/(x^1) = (2*y^-1)/3 // * x^1
1 = x^1*((2*y^-1)/3) // : (2*y^-1)/3
(3*y)/2 = x^1
x = (3*y)/2
x = (3*y)/2
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