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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3.6/y = 10.8/12 // - 10.8/12
3.6/y-(10.8/12) = 0
3.6/y-0.9 = 0
3.6*y^-1 = 0.9 // : 3.6
y^-1 = 0.25
-1 < 0
1/(y^1) = 0.25 // * y^1
1 = 0.25*y^1 // : 0.25
4 = y^1
y = 4
y = 4
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