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n in (-oo:+oo)
-347/7 = 3*n+(5/7)*n-5 // - 3*n+(5/7)*n-5
5-(3*n)-((5/7)*n)-347/7 = 0
(-5/7)*n-3*n-347/7+5 = 0
-26/7*n-312/7 = 0 // + 312/7
-26/7*n = 312/7 // : -26/7
n = 312/7/(-26/7)
n = -12
n = -12
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