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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y+2 = 12 // - 12
1/y-12+2 = 0
1*y^-1 = 10 // : 1
y^-1 = 10
-1 < 0
1/(y^1) = 10 // * y^1
1 = 10*y^1 // : 10
1/10 = y^1
y = 1/10
y = 1/10
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