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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
54/y = 72/844 // - 72/844
54/y-(72/844) = 0
54/y-18/211 = 0
54*y^-1 = 18/211 // : 54
y^-1 = 1/633
-1 < 0
1/(y^1) = 1/633 // * y^1
1 = 1/633*y^1 // : 1/633
633 = y^1
y = 633
y = 633
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