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x in (-oo:+oo)
n*(((1/1)*x^3)/2) = -7 // + 7
n*(((1/1)*x^3)/2)+7 = 0
n*((x^3)/2)+7 = 0
1/2*n*x^3 = -7 // : 1/2*n
x^3 = -14*n^-1
x^3 = -14*n^-1 // ^ 1/3
x = -14^(1/3)*n^(-1/3)
x = -14^(1/3)*n^(-1/3)
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