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n in (-oo:+oo)
18 = (3/4)*n // - (3/4)*n
18-((3/4)*n) = 0
(-3/4)*n+18 = 0
18-3/4*n = 0 // - 18
-3/4*n = -18 // : -3/4
n = -18/(-3/4)
n = 24
n = 24
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