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n in (-oo:+oo)
n/84-n = 2/5 // - 2/5
n/84-n-(2/5) = 0
n/84-n-2/5 = 0
-83/84*n-2/5 = 0 // + 2/5
-83/84*n = 2/5 // : -83/84
n = 2/5/(-83/84)
n = -168/415
n = -168/415
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