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x in (-oo:+oo)
2*7 = ((x+9)^2)/3 // - ((x+9)^2)/3
2*7-(((x+9)^2)/3) = 0
(-1*(x+9)^2)/3+14 = 0
(-1*(x+9)^2)/3+(3*14)/3 = 0
3*14-1*(x+9)^2 = 0
-x^2-18*x-39 = 0
-x^2-18*x-39 = 0
-1*(x^2+18*x+39) = 0
x^2+18*x+39 = 0
DELTA = 18^2-(1*4*39)
DELTA = 168
DELTA > 0
x = (168^(1/2)-18)/(1*2) or x = (-168^(1/2)-18)/(1*2)
x = (2*42^(1/2)-18)/2 or x = (-2*42^(1/2)-18)/2
-1*(x-((-2*42^(1/2)-18)/2))*(x-((2*42^(1/2)-18)/2)) = 0
(-1*(x-((-2*42^(1/2)-18)/2))*(x-((2*42^(1/2)-18)/2)))/3 = 0
(-1*(x-((-2*42^(1/2)-18)/2))*(x-((2*42^(1/2)-18)/2)))/3 = 0 // * 3
-1*(x-((-2*42^(1/2)-18)/2))*(x-((2*42^(1/2)-18)/2)) = 0
( x-((-2*42^(1/2)-18)/2) )
x-((-2*42^(1/2)-18)/2) = 0 // + (-2*42^(1/2)-18)/2
x = (-2*42^(1/2)-18)/2
( x-((2*42^(1/2)-18)/2) )
x-((2*42^(1/2)-18)/2) = 0 // + (2*42^(1/2)-18)/2
x = (2*42^(1/2)-18)/2
x in { (-2*42^(1/2)-18)/2, (2*42^(1/2)-18)/2 }
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