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(((4/3)^3)/4)*x = 15*(4/3) // - 15*(4/3)
(((4/3)^3)/4)*x-(15*(4/3)) = 0
(((4/3)^3)/4)*x-20 = 0
16/27*x-20 = 0 // + 20
16/27*x = 20 // : 16/27
x = 20/16/27
x = 135/4
x = 135/4
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