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n in (-oo:+oo)
7*(-(4*n)-3) = -301 // + 301
7*(-(4*n)-3)+301 = 0
7*(-4*n-3)+301 = 0
7*(-4*n-3)+301 = 0
280-28*n = 0
280-28*n = 0
280-28*n = 0 // - 280
-28*n = -280 // : -28
n = -280/(-28)
n = 10
n = 10
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