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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(12/x)*y = 60 // - 60
(12/x)*y-60 = 0
12*x^-1*y = 60 // : 12*y
x^-1 = 5*y^-1
-1 < 0
1/(x^1) = 5*y^-1 // * x^1
1 = 5*x^1*y^-1 // : 5*y^-1
1/(5*y^-1) = x^1
x = 1/(5*y^-1)
x = 1/(5*y^-1)
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