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27*s^2-((64/3)*x)-4 = 0
27*s^2+(-64/3)*x-4 = 0
27*s^2-64/3*x-4 = 0 // - 27*s^2-4
-64/3*x = -(27*s^2-4) // : -64/3
x = (-(27*s^2-4))/(-64/3)
x = -3/64*(4-(27*s^2))
x = -3/64*(4-(27*s^2))
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