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n in (-oo:+oo)
100/8 = 3*n // - 3*n
100/8-(3*n) = 0
100/8-3*n = 0
25/2-3*n = 0 // - 25/2
-3*n = -25/2 // : -3
n = -25/2/(-3)
n = 25/6
n = 25/6
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