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(5/2)*x^3+(7/3)*x = 0
5/2*x^3+7/3*x = 0
x*(5/2*x^2+7/3) = 0
5/2*x^2 = -7/3 // : 5/2
x^2 = -14/15
x = 0
x = 0
x = 0
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