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D( x )
x+1 = 0
x+6 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:-1) U (-1:+oo)
(-6/(x+1))*(x+6) = 6/(x+6)+5 // - 6/(x+6)+5
(-6/(x+1))*(x+6)-(6/(x+6))-5 = 0
(-6/(x+1))*(x+6)-6*(x+6)^-1-5 = 0
(-6*(x+6))/(x+1)-6/(x+6)-5 = 0
(-6*(x+6)^2)/((x+1)*(x+6))+(-6*(x+1))/((x+1)*(x+6))+(-5*(x+1)*(x+6))/((x+1)*(x+6)) = 0
-6*(x+6)^2-6*(x+1)-5*(x+1)*(x+6) = 0
-6*x^2-5*x^2-78*x-35*x-222-30 = 0
-11*x^2-113*x-252 = 0
-11*x^2-113*x-252 = 0
-1*(11*x^2+113*x+252) = 0
11*x^2+113*x+252 = 0
DELTA = 113^2-(4*11*252)
DELTA = 1681
DELTA > 0
x = (1681^(1/2)-113)/(2*11) or x = (-1681^(1/2)-113)/(2*11)
x = -36/11 or x = -7
-1*(x+7)*(x+36/11) = 0
(-1*(x+7)*(x+36/11))/((x+1)*(x+6)) = 0
(-1*(x+7)*(x+36/11))/((x+1)*(x+6)) = 0 // * (x+1)*(x+6)
-1*(x+7)*(x+36/11) = 0
( x+36/11 )
x+36/11 = 0 // - 36/11
x = -36/11
( x+7 )
x+7 = 0 // - 7
x = -7
x in { -36/11, -7 }
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