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n in (-oo:+oo)
12 = (30/4)*n // - (30/4)*n
12-((30/4)*n) = 0
(-15/2)*n+12 = 0
12-15/2*n = 0 // - 12
-15/2*n = -12 // : -15/2
n = -12/(-15/2)
n = 8/5
n = 8/5
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