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((5*x^3)/7)*x^3+x^4 = 0
5/7*x^6+x^4 = 0
x^4*(5/7*x^2+1) = 0
5/7*x^2 = -1 // : 5/7
x^2 = -7/5
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x = 0
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