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(1/9)*x^2+(11/3)*x-432 = 0
1/9*x^2+11/3*x-432 = 0
DELTA = (11/3)^2-(-432*1/9*4)
DELTA = 1849/9
DELTA > 0
x = ((1849/9)^(1/2)-11/3)/(1/9*2) or x = (-(1849/9)^(1/2)-11/3)/(1/9*2)
x = 48 or x = -81
x in { -81, 48 }
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