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n in (-oo:+oo)
83 = 4*n+4*n+3 // - 4*n+4*n+3
83-(4*n)-(4*n)-3 = 0
83-4*n-4*n-3 = 0
80-8*n = 0 // - 80
-8*n = -80 // : -8
n = -80/(-8)
n = 10
n = 10
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