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x in (-oo:+oo)
((5*x^2)/7)*x^3+x^4 = 0
5/7*x^5+x^4 = 0
x^4*(5/7*x+1) = 0
5/7*x+1 = 0 // - 1
5/7*x = -1 // : 5/7
x = -1/5/7
x = -7/5
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { -7/5, 0 }
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