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n in (-oo:+oo)
7*(5*n-5) = -105 // + 105
7*(5*n-5)+105 = 0
7*(5*n-5)+105 = 0
35*n+70 = 0
35*n+70 = 0
35*n+70 = 0 // - 70
35*n = -70 // : 35
n = -70/35
n = -2
n = -2
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