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n in (-oo:+oo)
(3/2)*n-2 = 31/4 // - 31/4
(3/2)*n-(31/4)-2 = 0
(3/2)*n-31/4-2 = 0
3/2*n-39/4 = 0 // + 39/4
3/2*n = 39/4 // : 3/2
n = 39/4/3/2
n = 13/2
n = 13/2
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