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n in (-oo:+oo)
-16/7 = 3*n+(2/7)*n+1 // - 3*n+(2/7)*n+1
-(3*n)-((2/7)*n)-16/7-1 = 0
(-2/7)*n-3*n-16/7-1 = 0
-23/7*n-23/7 = 0 // + 23/7
-23/7*n = 23/7 // : -23/7
n = 23/7/(-23/7)
n = -1
n = -1
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