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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2+2*x-49)/x+7 = 0
(x^2+2*x-49)/x+(7*x)/x = 0
x^2+2*x+7*x-49 = 0
x^2+9*x-49 = 0
x^2+9*x-49 = 0
x^2+9*x-49 = 0
DELTA = 9^2-(-49*1*4)
DELTA = 277
DELTA > 0
x = (277^(1/2)-9)/(1*2) or x = (-277^(1/2)-9)/(1*2)
x = (277^(1/2)-9)/2 or x = (-(277^(1/2)+9))/2
(x+(277^(1/2)+9)/2)*(x-((277^(1/2)-9)/2)) = 0
((x+(277^(1/2)+9)/2)*(x-((277^(1/2)-9)/2)))/x = 0
((x+(277^(1/2)+9)/2)*(x-((277^(1/2)-9)/2)))/x = 0 // * x
(x+(277^(1/2)+9)/2)*(x-((277^(1/2)-9)/2)) = 0
( x+(277^(1/2)+9)/2 )
x+(277^(1/2)+9)/2 = 0 // - (277^(1/2)+9)/2
x = -((277^(1/2)+9)/2)
( x-((277^(1/2)-9)/2) )
x-((277^(1/2)-9)/2) = 0 // + (277^(1/2)-9)/2
x = (277^(1/2)-9)/2
x in { -((277^(1/2)+9)/2), (277^(1/2)-9)/2 }
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