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x in (-oo:+oo)
(5*x^2-108)/3 = 4*x // - 4*x
(5*x^2-108)/3-(4*x) = 0
(5*x^2-108)/3-4*x = 0
(5*x^2-108)/3+(-4*3*x)/3 = 0
5*x^2-4*3*x-108 = 0
5*x^2-12*x-108 = 0
5*x^2-12*x-108 = 0
5*x^2-12*x-108 = 0
DELTA = (-12)^2-(-108*4*5)
DELTA = 2304
DELTA > 0
x = (2304^(1/2)+12)/(2*5) or x = (12-2304^(1/2))/(2*5)
x = 6 or x = -18/5
(x+18/5)*(x-6) = 0
((x+18/5)*(x-6))/3 = 0
((x+18/5)*(x-6))/3 = 0 // * 3
(x+18/5)*(x-6) = 0
( x+18/5 )
x+18/5 = 0 // - 18/5
x = -18/5
( x-6 )
x-6 = 0 // + 6
x = 6
x in { -18/5, 6 }
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