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n in (-oo:+oo)
42/12 = n/5 // - n/5
42/12-(n/5) = 0
7/2-1/5*n = 0 // - 7/2
-1/5*n = -7/2 // : -1/5
n = -7/2/(-1/5)
n = 35/2
n = 35/2
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