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n in (-oo:+oo)
3*n+1/4 = 13/4 // - 13/4
3*n+1/4-(13/4) = 0
3*n+1/4-13/4 = 0
3*n-3 = 0 // + 3
3*n = 3 // : 3
n = 3/3
n = 1
n = 1
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