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n in (-oo:+oo)
((3*n^1)/2)*n = 42 // - 42
((3*n^1)/2)*n-42 = 0
((3*n)/2)*n-42 = 0
3/2*n^2 = 42 // : 3/2
n^2 = 28
n^2 = 28 // ^ 1/2
abs(n) = 2*7^(1/2)
n = 2*7^(1/2) or n = -(2*7^(1/2))
n in { 2*7^(1/2), -(2*7^(1/2)) }
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