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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
90/y = 48/32 // - 48/32
90/y-(48/32) = 0
90/y-3/2 = 0
90*y^-1 = 3/2 // : 90
y^-1 = 1/60
-1 < 0
1/(y^1) = 1/60 // * y^1
1 = 1/60*y^1 // : 1/60
60 = y^1
y = 60
y = 60
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