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D( y )
y-3 = 0
y-3 = 0
y-3 = 0
y-3 = 0 // + 3
y = 3
y in (-oo:3) U (3:+oo)
(7*y-2)/3 = -4/(y-3) // + -4/(y-3)
(7*y-2)/3-(-4/(y-3)) = 0
(7*y-2)/3+4*(y-3)^-1 = 0
(7*y-2)/3+4/(y-3) = 0
((7*y-2)*(y-3))/(3*(y-3))+(3*4)/(3*(y-3)) = 0
(7*y-2)*(y-3)+3*4 = 0
7*y^2-23*y+18 = 0
7*y^2-23*y+18 = 0
7*y^2-23*y+18 = 0
DELTA = (-23)^2-(4*7*18)
DELTA = 25
DELTA > 0
y = (25^(1/2)+23)/(2*7) or y = (23-25^(1/2))/(2*7)
y = 2 or y = 9/7
(y-9/7)*(y-2) = 0
((y-9/7)*(y-2))/(3*(y-3)) = 0
((y-9/7)*(y-2))/(3*(y-3)) = 0 // * 3*(y-3)
(y-9/7)*(y-2) = 0
( y-2 )
y-2 = 0 // + 2
y = 2
( y-9/7 )
y-9/7 = 0 // + 9/7
y = 9/7
y in { 2, 9/7 }
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