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3*x^2-((64/3)*x^3)-(9*x) = 0
(-64/3)*x^3+3*x^2-9*x = 0
3*x^2-64/3*x^3-9*x = 0
x*(3*x-64/3*x^2-9) = 0
3*x-64/3*x^2-9 = 0
DELTA = 3^2-(-64/3*(-9)*4)
DELTA = -759
DELTA < 0
x = 0
x = 0
x = 0
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