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((5*x)/3)*(7*x^2-(9*x)+9) = 0
((5*x)/3)*(7*x^2-9*x+9) = 0
5/3*x*(7*x^2-9*x+9) = 0
7*x^2-9*x+9 = 0
7*x^2-9*x+9 = 0
DELTA = (-9)^2-(4*7*9)
DELTA = -171
DELTA < 0
1 = 0
(5*x)/3 = 0
5/3*x = 0 // : 5/3
x = 0
x = 0
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