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x in (-oo:+oo)
((x-1)^2)/3 = 7 // - 7
((x-1)^2)/3-7 = 0
((x-1)^2)/3+(-7*3)/3 = 0
(x-1)^2-7*3 = 0
x^2-2*x-20 = 0
x^2-2*x-20 = 0
x^2-2*x-20 = 0
DELTA = (-2)^2-(-20*1*4)
DELTA = 84
DELTA > 0
x = (84^(1/2)+2)/(1*2) or x = (2-84^(1/2))/(1*2)
x = (2*21^(1/2)+2)/2 or x = (2-2*21^(1/2))/2
(x-((2-2*21^(1/2))/2))*(x-((2*21^(1/2)+2)/2)) = 0
((x-((2-2*21^(1/2))/2))*(x-((2*21^(1/2)+2)/2)))/3 = 0
((x-((2-2*21^(1/2))/2))*(x-((2*21^(1/2)+2)/2)))/3 = 0 // * 3
(x-((2-2*21^(1/2))/2))*(x-((2*21^(1/2)+2)/2)) = 0
( x-((2*21^(1/2)+2)/2) )
x-((2*21^(1/2)+2)/2) = 0 // + (2*21^(1/2)+2)/2
x = (2*21^(1/2)+2)/2
( x-((2-2*21^(1/2))/2) )
x-((2-2*21^(1/2))/2) = 0 // + (2-2*21^(1/2))/2
x = (2-2*21^(1/2))/2
x in { (2*21^(1/2)+2)/2, (2-2*21^(1/2))/2 }
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