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a in (-oo:+oo)
((10*a)/3)*a^2+2*a^2+15*a = 0
10/3*a^3+2*a^2+15*a = 0
a*(10/3*a^2+2*a+15) = 0
10/3*a^2+2*a+15 = 0
DELTA = 2^2-(10/3*4*15)
DELTA = -196
DELTA < 0
a = 0
a = 0
a = 0
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