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