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n in (-oo:+oo)
(3/4)*n-3 = n // - n
(3/4)*n-n-3 = 0
-1/4*n-3 = 0 // + 3
-1/4*n = 3 // : -1/4
n = 3/(-1/4)
n = -12
n = -12
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