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n in (-oo:+oo)
3/7-3*n = 45/7 // - 45/7
3/7-3*n-(45/7) = 0
3/7-3*n-45/7 = 0
-3*n-6 = 0 // + 6
-3*n = 6 // : -3
n = 6/(-3)
n = -2
n = -2
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