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((6/7)*x^3)/4 = n/28 // - n/28
((6/7)*x^3)/4-(n/28) = 0
3/14*x^3 = -(-1/28*n) // : 3/14
x^3 = 1/6*n
x^3 = 1/6*n // ^ 1/3
x = (1/6)^(1/3)*n^(1/3)
x = (1/6)^(1/3)*n^(1/3)
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