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D( y )
y-6 = 0
y-6 = 0
y-6 = 0
y-6 = 0 // + 6
y = 6
y in (-oo:6) U (6:+oo)
7/(27-12)+1 = -4/(y-6) // + -4/(y-6)
7/(27-12)-(-4/(y-6))+1 = 0
4*(y-6)^-1+7/(27-12)+1 = 0
4/(y-6)+7/15+1 = 0
(4*15)/(15*(y-6))+(7*(y-6))/(15*(y-6))+(1*15*(y-6))/(15*(y-6)) = 0
7*(y-6)+1*15*(y-6)+4*15 = 0
7*y+15*y-90+18 = 0
22*y-72 = 0
(22*y-72)/(15*(y-6)) = 0
(22*y-72)/(15*(y-6)) = 0 // * 15*(y-6)
22*y-72 = 0
22*y-72 = 0 // + 72
22*y = 72 // : 22
y = 72/22
y = 36/11
y = 36/11
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