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x in (-oo:+oo)
(x-2)*(x+1) = 3*x+7/3 // - 3*x+7/3
(x-2)*(x+1)-(3*x)-(7/3) = 0
(x-2)*(x+1)-3*x-7/3 = 0
(3*(x-2)*(x+1))/3+(-3*3*x)/3-7/3 = 0
3*(x-2)*(x+1)-3*3*x-7 = 0
3*x^2-12*x-7-6 = 0
3*x^2-12*x-13 = 0
3*x^2-12*x-13 = 0
3*x^2-12*x-13 = 0
DELTA = (-12)^2-(-13*3*4)
DELTA = 300
DELTA > 0
x = (300^(1/2)+12)/(2*3) or x = (12-300^(1/2))/(2*3)
x = (10*3^(1/2)+12)/6 or x = (12-10*3^(1/2))/6
(x-((12-10*3^(1/2))/6))*(x-((10*3^(1/2)+12)/6)) = 0
((x-((12-10*3^(1/2))/6))*(x-((10*3^(1/2)+12)/6)))/3 = 0
((x-((12-10*3^(1/2))/6))*(x-((10*3^(1/2)+12)/6)))/3 = 0 // * 3
(x-((12-10*3^(1/2))/6))*(x-((10*3^(1/2)+12)/6)) = 0
( x-((10*3^(1/2)+12)/6) )
x-((10*3^(1/2)+12)/6) = 0 // + (10*3^(1/2)+12)/6
x = (10*3^(1/2)+12)/6
( x-((12-10*3^(1/2))/6) )
x-((12-10*3^(1/2))/6) = 0 // + (12-10*3^(1/2))/6
x = (12-10*3^(1/2))/6
x in { (10*3^(1/2)+12)/6, (12-10*3^(1/2))/6 }
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