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x in (-oo:+oo)
(((6*x)/30)/4)*x = 10*(x/3) // - 10*(x/3)
(((6*x)/30)/4)*x-(10*(x/3)) = 0
(((6*x)/30)/4)*x+(-10/3)*x = 0
1/20*x^2-10/3*x = 0
DELTA = (-10/3)^2-(0*1/20*4)
DELTA = 100/9
DELTA > 0
x = ((100/9)^(1/2)+10/3)/(1/20*2) or x = (10/3-(100/9)^(1/2))/(1/20*2)
x = 200/3 or x = 0
x in { 0, 200/3 }
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