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x in (-oo:+oo)
-12 = ((x+5)^2)/(-3) // - ((x+5)^2)/(-3)
-(((x+5)^2)/(-3))-12 = 0
(-1*(x+5)^2)/(-3)-12 = 0
(-1*(x+5)^2)/(-3)+(-12*(-3))/(-3) = 0
-1*(x+5)^2-12*(-3) = 0
11-x^2-10*x = 0
11-x^2-10*x = 0
11-x^2-10*x = 0
DELTA = (-10)^2-(-1*4*11)
DELTA = 144
DELTA > 0
x = (144^(1/2)+10)/(-1*2) or x = (10-144^(1/2))/(-1*2)
x = -11 or x = 1
(x+11)*(x-1) = 0
((x+11)*(x-1))/(-3) = 0
((x+11)*(x-1))/(-3) = 0 // * -3
(x+11)*(x-1) = 0
( x+11 )
x+11 = 0 // - 11
x = -11
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -11, 1 }
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