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n in (-oo:+oo)
n+8 = 7*n-40 // - 7*n-40
n-(7*n)+8+40 = 0
n-7*n+8+40 = 0
48-6*n = 0 // - 48
-6*n = -48 // : -6
n = -48/(-6)
n = 8
n = 8
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