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72*x^2-((8/9)*x) = 0
72*x^2+(-8/9)*x = 0
72*x^2-8/9*x = 0
DELTA = (-8/9)^2-(0*4*72)
DELTA = 64/81
DELTA > 0
x = ((64/81)^(1/2)+8/9)/(2*72) or x = (8/9-(64/81)^(1/2))/(2*72)
x = 1/81 or x = 0
x in { 0, 1/81 }
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