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n in (-oo:+oo)
9/5 = n/12 // - n/12
9/5-(n/12) = 0
9/5-1/12*n = 0 // - 9/5
-1/12*n = -9/5 // : -1/12
n = -9/5/(-1/12)
n = 108/5
n = 108/5
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