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9*w-((21/6)*x^6) = 0
9*w+(-7/2)*x^6 = 0
-7/2*x^6 = -(9*w) // : -7/2
x^6 = 18/7*w
x^6 = 18/7*w // ^ 1/6
abs(x) = (18/7)^(1/6)*w^(1/6)
x = (18/7)^(1/6)*w^(1/6) or x = -((18/7)^(1/6)*w^(1/6))
x in { (18/7)^(1/6)*w^(1/6), -((18/7)^(1/6)*w^(1/6)) }
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