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n in (-oo:+oo)
-2*n-(3/2) = -91/6 // + -91/6
-2*n-(3/2)-(-91/6) = 0
91/6-2*n-3/2 = 0
41/3-2*n = 0 // - 41/3
-2*n = -41/3 // : -2
n = -41/3/(-2)
n = 41/6
n = 41/6
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