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n in (-oo:+oo)
7*(5*n+5) = 315 // - 315
7*(5*n+5)-315 = 0
7*(5*n+5)-315 = 0
35*n-280 = 0
35*n-280 = 0
35*n-280 = 0 // + 280
35*n = 280 // : 35
n = 280/35
n = 8
n = 8
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