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(1/3)*x^2-((1/15)*x)-(17/18) = 0
(1/3)*x^2+(-1/15)*x-17/18 = 0
1/3*x^2-1/15*x-17/18 = 0
DELTA = (-1/15)^2-(-17/18*1/3*4)
DELTA = 853/675
DELTA > 0
x = ((853/675)^(1/2)+1/15)/(1/3*2) or x = (1/15-(853/675)^(1/2))/(1/3*2)
x = 3/2*((853/675)^(1/2)+1/15) or x = 3/2*(1/15-(853/675)^(1/2))
x in { 3/2*(1/15-(853/675)^(1/2)), 3/2*((853/675)^(1/2)+1/15) }
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