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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-180/y = 15 // - 15
-180/y-15 = 0
-180*y^-1 = 15 // : -180
y^-1 = -1/12
-1 < 0
1/(y^1) = -1/12 // * y^1
1 = -1/12*y^1 // : -1/12
-12 = y^1
y = -12
y = -12
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