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n in (-oo:+oo)
7*(-5*n-9) = -343 // + 343
7*(-5*n-9)+343 = 0
7*(-5*n-9)+343 = 0
280-35*n = 0
280-35*n = 0
280-35*n = 0 // - 280
-35*n = -280 // : -35
n = -280/(-35)
n = 8
n = 8
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