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x in (-oo:+oo)
(2*(x+3)^2)/3 = 72 // - 72
(2*(x+3)^2)/3-72 = 0
(2*(x+3)^2)/3+(-72*3)/3 = 0
2*(x+3)^2-72*3 = 0
2*x^2+12*x-198 = 0
2*x^2+12*x-198 = 0
2*(x^2+6*x-99) = 0
x^2+6*x-99 = 0
DELTA = 6^2-(-99*1*4)
DELTA = 432
DELTA > 0
x = (432^(1/2)-6)/(1*2) or x = (-432^(1/2)-6)/(1*2)
x = (12*3^(1/2)-6)/2 or x = (-12*3^(1/2)-6)/2
2*(x-((-12*3^(1/2)-6)/2))*(x-((12*3^(1/2)-6)/2)) = 0
(2*(x-((-12*3^(1/2)-6)/2))*(x-((12*3^(1/2)-6)/2)))/3 = 0
(2*(x-((-12*3^(1/2)-6)/2))*(x-((12*3^(1/2)-6)/2)))/3 = 0 // * 3
2*(x-((-12*3^(1/2)-6)/2))*(x-((12*3^(1/2)-6)/2)) = 0
( x-((-12*3^(1/2)-6)/2) )
x-((-12*3^(1/2)-6)/2) = 0 // + (-12*3^(1/2)-6)/2
x = (-12*3^(1/2)-6)/2
( x-((12*3^(1/2)-6)/2) )
x-((12*3^(1/2)-6)/2) = 0 // + (12*3^(1/2)-6)/2
x = (12*3^(1/2)-6)/2
x in { (-12*3^(1/2)-6)/2, (12*3^(1/2)-6)/2 }
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