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n in (-oo:+oo)
12 = (3/4)*n // - (3/4)*n
12-((3/4)*n) = 0
(-3/4)*n+12 = 0
12-3/4*n = 0 // - 12
-3/4*n = -12 // : -3/4
n = -12/(-3/4)
n = 16
n = 16
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