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D( y )
y+1 = 0
y-5 = 0
y+1 = 0
y+1 = 0
y+1 = 0 // - 1
y = -1
y-5 = 0
y-5 = 0
y-5 = 0 // + 5
y = 5
y in (-oo:-1) U (-1:5) U (5:+oo)
3/(y-5)-(2/(y+1))+3 = 0
3/(y-5)-2*(y+1)^-1+3 = 0
3/(y-5)-2/(y+1)+3 = 0
(3*(y+1))/((y-5)*(y+1))+(-2*(y-5))/((y-5)*(y+1))+(3*(y-5)*(y+1))/((y-5)*(y+1)) = 0
3*(y+1)-2*(y-5)+3*(y-5)*(y+1) = 0
3*y^2+y-12*y-15+13 = 0
3*y^2-11*y-2 = 0
3*y^2-11*y-2 = 0
3*y^2-11*y-2 = 0
DELTA = (-11)^2-(-2*3*4)
DELTA = 145
DELTA > 0
y = (145^(1/2)+11)/(2*3) or y = (11-145^(1/2))/(2*3)
y = (145^(1/2)+11)/6 or y = (11-145^(1/2))/6
(y-((11-145^(1/2))/6))*(y-((145^(1/2)+11)/6)) = 0
((y-((11-145^(1/2))/6))*(y-((145^(1/2)+11)/6)))/((y-5)*(y+1)) = 0
((y-((11-145^(1/2))/6))*(y-((145^(1/2)+11)/6)))/((y-5)*(y+1)) = 0 // * (y-5)*(y+1)
(y-((11-145^(1/2))/6))*(y-((145^(1/2)+11)/6)) = 0
( y-((11-145^(1/2))/6) )
y-((11-145^(1/2))/6) = 0 // + (11-145^(1/2))/6
y = (11-145^(1/2))/6
( y-((145^(1/2)+11)/6) )
y-((145^(1/2)+11)/6) = 0 // + (145^(1/2)+11)/6
y = (145^(1/2)+11)/6
y in { (11-145^(1/2))/6, (145^(1/2)+11)/6 }
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