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x*((12*x^2+9*x-7)/3) = 0
(x*(12*x^2+9*x-7))/3 = 0
12*x^2+9*x-7 = 0
12*x^2+9*x-7 = 0
DELTA = 9^2-(-7*4*12)
DELTA = 417
DELTA > 0
x = (417^(1/2)-9)/(2*12) or x = (-417^(1/2)-9)/(2*12)
x = (417^(1/2)-9)/24 or x = (-(417^(1/2)+9))/24
(x+(417^(1/2)+9)/24)*(x-((417^(1/2)-9)/24)) = 0
(x*(x+(417^(1/2)+9)/24)*(x-((417^(1/2)-9)/24)))/3 = 0
( x+(417^(1/2)+9)/24 )
x+(417^(1/2)+9)/24 = 0 // - (417^(1/2)+9)/24
x = -((417^(1/2)+9)/24)
( x-((417^(1/2)-9)/24) )
x-((417^(1/2)-9)/24) = 0 // + (417^(1/2)-9)/24
x = (417^(1/2)-9)/24
( x )
x = 0
x in { -((417^(1/2)+9)/24), (417^(1/2)-9)/24, 0 }
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