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8*u-(((20*u^4*x)/12)*u^2*w^5) = 0
8*u+(-5/3)*u^6*w^5*x = 0
8*u-5/3*u^6*w^5*x = 0 // - 8*u
-5/3*u^6*w^5*x = -(8*u) // : -5/3*u^6*w^5
x = (-(8*u))/(-5/3*u^6*w^5)
x = 24/5*u^-5*w^-5
x = 24/5*u^-5*w^-5
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