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(15*x^3)/n = 45/12 // - 45/12
(15*x^3)/n-(45/12) = 0
(15*x^3)/n-15/4 = 0
15*n^-1*x^3 = 15/4 // : 15*n^-1
x^3 = 1/4*n
x^3 = 1/4*n // ^ 1/3
x = (1/4)^(1/3)*n^(1/3)
x = (1/4)^(1/3)*n^(1/3)
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