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n in (-oo:+oo)
2*n-(5*n)+7 = -8 // + 8
2*n-(5*n)+7+8 = 0
2*n-5*n+7+8 = 0
15-3*n = 0 // - 15
-3*n = -15 // : -3
n = -15/(-3)
n = 5
n = 5
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