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n in (-oo:+oo)
3/8 = (9/2)*n // - (9/2)*n
3/8-((9/2)*n) = 0
(-9/2)*n+3/8 = 0
3/8-9/2*n = 0 // - 3/8
-9/2*n = -3/8 // : -9/2
n = -3/8/(-9/2)
n = 1/12
n = 1/12
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