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(4*9*x*x^1)/2-((6*x^1)/3) = 0
(4*9*x*x)/2-2*x = 0
18*x^2-2*x = 0
DELTA = (-2)^2-(0*4*18)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2)/(2*18) or x = (2-4^(1/2))/(2*18)
x = 1/9 or x = 0
x in { 0, 1/9 }
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