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n in (-oo:+oo)
-4*n-6 = 5*n-(78/7) // - 5*n-(78/7)
78/7-4*n-(5*n)-6 = 0
78/7-4*n-5*n-6 = 0
36/7-9*n = 0 // - 36/7
-9*n = -36/7 // : -9
n = -36/7/(-9)
n = 4/7
n = 4/7
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