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n in (-oo:+oo)
5 = 3*n+8/4 // - 3*n+8/4
5-(3*n)-(8/4) = 0
5-3*n-2 = 0
3-3*n = 0 // - 3
-3*n = -3 // : -3
n = -3/(-3)
n = 1
n = 1
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