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n in (-oo:+oo)
83 = 4*n+3*n-1 // - 4*n+3*n-1
1-(4*n)-(3*n)+83 = 0
1-4*n-3*n+83 = 0
84-7*n = 0 // - 84
-7*n = -84 // : -7
n = -84/(-7)
n = 12
n = 12
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