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D( y )
2*y-3 = 0
2*y-3 = 0
2*y-3 = 0
2*y-3 = 0 // + 3
2*y = 3 // : 2
y = 3/2
y in (-oo:3/2) U (3/2:+oo)
4/(2*y-3) = 7*(3*y-5) // - 7*(3*y-5)
4/(2*y-3)-(7*(3*y-5)) = 0
4/(2*y-3)-7*(3*y-5) = 0
4/(2*y-3)+(-7*(3*y-5)*(2*y-3))/(2*y-3) = 0
4-7*(3*y-5)*(2*y-3) = 0
133*y-42*y^2-101 = 0
133*y-42*y^2-101 = 0
133*y-42*y^2-101 = 0
DELTA = 133^2-(-101*(-42)*4)
DELTA = 721
DELTA > 0
y = (721^(1/2)-133)/(-42*2) or y = (-721^(1/2)-133)/(-42*2)
y = (721^(1/2)-133)/(-84) or y = (721^(1/2)+133)/84
(y-((721^(1/2)-133)/(-84)))*(y-((721^(1/2)+133)/84)) = 0
((y-((721^(1/2)-133)/(-84)))*(y-((721^(1/2)+133)/84)))/(2*y-3) = 0
((y-((721^(1/2)-133)/(-84)))*(y-((721^(1/2)+133)/84)))/(2*y-3) = 0 // * 2*y-3
(y-((721^(1/2)-133)/(-84)))*(y-((721^(1/2)+133)/84)) = 0
( y-((721^(1/2)+133)/84) )
y-((721^(1/2)+133)/84) = 0 // + (721^(1/2)+133)/84
y = (721^(1/2)+133)/84
( y-((721^(1/2)-133)/(-84)) )
y-((721^(1/2)-133)/(-84)) = 0 // + (721^(1/2)-133)/(-84)
y = (721^(1/2)-133)/(-84)
y in { (721^(1/2)+133)/84, (721^(1/2)-133)/(-84) }
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