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n in (-oo:+oo)
7/12 = n/144 // - n/144
7/12-(n/144) = 0
7/12-1/144*n = 0 // - 7/12
-1/144*n = -7/12 // : -1/144
n = -7/12/(-1/144)
n = 84
n = 84
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