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(9*x^3)/5 = 8*w // - 8*w
(9*x^3)/5-(8*w) = 0
(9*x^3)/5-8*w = 0
9/5*x^3 = -(-8*w) // : 9/5
x^3 = 40/9*w
x^3 = 40/9*w // ^ 1/3
x = (40/9)^(1/3)*w^(1/3)
x = (40/9)^(1/3)*w^(1/3)
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