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n in (-oo:+oo)
7*(4*n+5) = -105 // + 105
7*(4*n+5)+105 = 0
7*(4*n+5)+105 = 0
28*n+140 = 0
28*n+140 = 0
28*n+140 = 0 // - 140
28*n = -140 // : 28
n = -140/28
n = -5
n = -5
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