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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.2/y+1.2/y-1 = 1 // - 1
1.2/y+1.2/y-1-1 = 0
2.4*y^-1 = 2 // : 2.4
y^-1 = 0.83333333
-1 < 0
1/(y^1) = 0.83333333 // * y^1
1 = 0.83333333*y^1 // : 0.83333333
1.2 = y^1
y = 1.2
y = 1.2
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