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x in (-oo:+oo)
(-5/3)*X-((6/7)*x^4) = 0
(-5/3)*X+(-6/7)*x^4 = 0
-6/7*x^4 = -(-5/3*X) // : -6/7
x^4 = -35/18*X
x^4 = -35/18*X // ^ 1/4
abs(x) = (-35/18)^(1/4)*X^(1/4)
x = (-35/18)^(1/4)*X^(1/4) or x = -((-35/18)^(1/4)*X^(1/4))
x in { (-35/18)^(1/4)*X^(1/4), -((-35/18)^(1/4)*X^(1/4)) }
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