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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x+6)/14+(2*x+y-1)/x+3 = (2.5*x+24)/7 // - (2.5*x+24)/7
(5*x+6)/14+(2*x+y-1)/x-((2.5*x+24)/7)+3 = 0
(5*x+6)/14+(2*x+y-1)/x+(-1*(2.5*x+24))/7+3 = 0
(7*x*(5*x+6))/(7*14*x)+(7*14*(2*x+y-1))/(7*14*x)+(-1*14*x*(2.5*x+24))/(7*14*x)+(3*7*14*x)/(7*14*x) = 0
7*x*(5*x+6)+7*14*(2*x+y-1)-1*14*x*(2.5*x+24)+3*7*14*x = 0
35*x^2-35*x^2+238*x-336*x+294*x+98*y-98 = 0
294*x-98*x+98*y-98 = 0
196*x+98*y-98 = 0
(196*x+98*y-98)/(7*14*x) = 0
(196*x+98*y-98)/(7*14*x) = 0 // * 7*14*x
196*x+98*y-98 = 0
196*x+98*y-98 = 0 // - 98*y-98
196*x = -(98*y-98) // : 196
x = (-(98*y-98))/196
x = (98-(98*y))/196
x = (98-(98*y))/196
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