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D( x )
(7*x+1)^2 = 0
7*x+1 = 0
(7*x+1)^2 = 0
(7*x+1)^2 = 0
7*x+1 = 0 // - 1
7*x = -1 // : 7
x = -1/7
7*x+1 = 0
7*x+1 = 0
7*x+1 = 0 // - 1
7*x = -1 // : 7
x = -1/7
x in (-oo:-1/7) U (-1/7:+oo)
1-(1/(7*x+1))-(1/((7*x+1)^2)) = 0
1-(7*x+1)^-1-(7*x+1)^-2 = 0
1-1/(7*x+1)-1/((7*x+1)^2) = 0
(-1*(7*x+1))/((7*x+1)^2)-1/((7*x+1)^2)+(1*(7*x+1)^2)/((7*x+1)^2) = 0
1*(7*x+1)^2-1*(7*x+1)-1 = 0
49*x^2-7*x+14*x-2+1 = 0
49*x^2+7*x-1 = 0
49*x^2+7*x-1 = 0
49*x^2+7*x-1 = 0
DELTA = 7^2-(-1*4*49)
DELTA = 245
DELTA > 0
x = (245^(1/2)-7)/(2*49) or x = (-245^(1/2)-7)/(2*49)
x = (7*5^(1/2)-7)/98 or x = (-7*5^(1/2)-7)/98
(x-((-7*5^(1/2)-7)/98))*(x-((7*5^(1/2)-7)/98)) = 0
((x-((-7*5^(1/2)-7)/98))*(x-((7*5^(1/2)-7)/98)))/((7*x+1)^2) = 0
((x-((-7*5^(1/2)-7)/98))*(x-((7*5^(1/2)-7)/98)))/((7*x+1)^2) = 0 // * (7*x+1)^2
(x-((-7*5^(1/2)-7)/98))*(x-((7*5^(1/2)-7)/98)) = 0
( x-((-7*5^(1/2)-7)/98) )
x-((-7*5^(1/2)-7)/98) = 0 // + (-7*5^(1/2)-7)/98
x = (-7*5^(1/2)-7)/98
( x-((7*5^(1/2)-7)/98) )
x-((7*5^(1/2)-7)/98) = 0 // + (7*5^(1/2)-7)/98
x = (7*5^(1/2)-7)/98
x in { (-7*5^(1/2)-7)/98, (7*5^(1/2)-7)/98 }
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