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D( y )
y+5 = 0
y+5 = 0
y+5 = 0
y+5 = 0 // - 5
y = -5
y in (-oo:-5) U (-5:+oo)
7/(y+5) = (-7/2)*y+2+10 // - (-7/2)*y+2+10
7/(y+5)-((-7/2)*y)-10-2 = 0
7/(y+5)+(7/2)*y-10-2 = 0
7/(y+5)+(7*y)/2-10-2 = 0
(2*7)/(2*(y+5))+(7*y*(y+5))/(2*(y+5))+(-10*2*(y+5))/(2*(y+5))+(-2*2*(y+5))/(2*(y+5)) = 0
7*y*(y+5)-10*2*(y+5)-2*2*(y+5)+2*7 = 0
7*y^2+35*y-20*y-4*y-100-20+14 = 0
7*y^2+15*y-4*y-86-20 = 0
7*y^2+11*y-106 = 0
7*y^2+11*y-106 = 0
7*y^2+11*y-106 = 0
DELTA = 11^2-(-106*4*7)
DELTA = 3089
DELTA > 0
y = (3089^(1/2)-11)/(2*7) or y = (-3089^(1/2)-11)/(2*7)
y = (3089^(1/2)-11)/14 or y = (-(3089^(1/2)+11))/14
(y+(3089^(1/2)+11)/14)*(y-((3089^(1/2)-11)/14)) = 0
((y+(3089^(1/2)+11)/14)*(y-((3089^(1/2)-11)/14)))/(2*(y+5)) = 0
((y+(3089^(1/2)+11)/14)*(y-((3089^(1/2)-11)/14)))/(2*(y+5)) = 0 // * 2*(y+5)
(y+(3089^(1/2)+11)/14)*(y-((3089^(1/2)-11)/14)) = 0
( y+(3089^(1/2)+11)/14 )
y+(3089^(1/2)+11)/14 = 0 // - (3089^(1/2)+11)/14
y = -((3089^(1/2)+11)/14)
( y-((3089^(1/2)-11)/14) )
y-((3089^(1/2)-11)/14) = 0 // + (3089^(1/2)-11)/14
y = (3089^(1/2)-11)/14
y in { -((3089^(1/2)+11)/14), (3089^(1/2)-11)/14 }
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