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2*(x/9)*x+2*(1/3)*x-(12*x) = 0
2*(x/9)*x+2*(1/3)*x-12*x = 0
2/9*x^2-34/3*x = 0
DELTA = (-34/3)^2-(0*2/9*4)
DELTA = 1156/9
DELTA > 0
x = ((1156/9)^(1/2)+34/3)/(2/9*2) or x = (34/3-(1156/9)^(1/2))/(2/9*2)
x = 51 or x = 0
x in { 0, 51 }
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