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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/15 = 6/y-5 // - 6/y-5
2/15-(6/y)+5 = 0
2/15-6*y^-1+5 = 0
-6*y^-1 = -77/15 // : -6
y^-1 = 77/90
-1 < 0
1/(y^1) = 77/90 // * y^1
1 = 77/90*y^1 // : 77/90
90/77 = y^1
y = 90/77
y = 90/77
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