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x in (-oo:+oo)
((12*x)/6)*x-((15/2)*x^3)-((10/9)*x) = 0
(-15/2)*x^3+((12*x)/6)*x+(-10/9)*x = 0
2*x^2-15/2*x^3-10/9*x = 0
x*(2*x-15/2*x^2-10/9) = 0
2*x-15/2*x^2-10/9 = 0
DELTA = 2^2-(-15/2*(-10/9)*4)
DELTA = -88/3
DELTA < 0
x = 0
x = 0
x = 0
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