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n in (-oo:+oo)
7/8 = n/40 // - n/40
7/8-(n/40) = 0
7/8-1/40*n = 0 // - 7/8
-1/40*n = -7/8 // : -1/40
n = -7/8/(-1/40)
n = 35
n = 35
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