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x in (-oo:+oo)
x/3 = ((12*x)/5)*x-1 // - ((12*x)/5)*x-1
x/3-(((12*x)/5)*x)+1 = 0
(-12/5)*x^2+x/3+1 = 0
1/3*x-12/5*x^2+1 = 0
DELTA = (1/3)^2-(-12/5*1*4)
DELTA = 437/45
DELTA > 0
x = ((437/45)^(1/2)-1/3)/(-12/5*2) or x = (-(437/45)^(1/2)-1/3)/(-12/5*2)
x = -5/24*((437/45)^(1/2)-1/3) or x = 5/24*((437/45)^(1/2)+1/3)
x in { -5/24*((437/45)^(1/2)-1/3), 5/24*((437/45)^(1/2)+1/3) }
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