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D( u )
u+5 = 0
u+5 = 0
u+5 = 0
u+5 = 0 // - 5
u = -5
u in (-oo:-5) U (-5:+oo)
5/(u+5) = (-7/2)*u+2+10 // - (-7/2)*u+2+10
5/(u+5)-((-7/2)*u)-10-2 = 0
5/(u+5)+(7/2)*u-10-2 = 0
5/(u+5)+(7*u)/2-10-2 = 0
(2*5)/(2*(u+5))+(7*u*(u+5))/(2*(u+5))+(-10*2*(u+5))/(2*(u+5))+(-2*2*(u+5))/(2*(u+5)) = 0
7*u*(u+5)-10*2*(u+5)-2*2*(u+5)+2*5 = 0
7*u^2+35*u-20*u-4*u-100-20+10 = 0
7*u^2+15*u-4*u-90-20 = 0
7*u^2+11*u-110 = 0
7*u^2+11*u-110 = 0
7*u^2+11*u-110 = 0
DELTA = 11^2-(-110*4*7)
DELTA = 3201
DELTA > 0
u = (3201^(1/2)-11)/(2*7) or u = (-3201^(1/2)-11)/(2*7)
u = (3201^(1/2)-11)/14 or u = (-(3201^(1/2)+11))/14
(u+(3201^(1/2)+11)/14)*(u-((3201^(1/2)-11)/14)) = 0
((u+(3201^(1/2)+11)/14)*(u-((3201^(1/2)-11)/14)))/(2*(u+5)) = 0
((u+(3201^(1/2)+11)/14)*(u-((3201^(1/2)-11)/14)))/(2*(u+5)) = 0 // * 2*(u+5)
(u+(3201^(1/2)+11)/14)*(u-((3201^(1/2)-11)/14)) = 0
( u+(3201^(1/2)+11)/14 )
u+(3201^(1/2)+11)/14 = 0 // - (3201^(1/2)+11)/14
u = -((3201^(1/2)+11)/14)
( u-((3201^(1/2)-11)/14) )
u-((3201^(1/2)-11)/14) = 0 // + (3201^(1/2)-11)/14
u = (3201^(1/2)-11)/14
u in { -((3201^(1/2)+11)/14), (3201^(1/2)-11)/14 }
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