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n in (-oo:+oo)
5*(3*n+1) = -175 // + 175
5*(3*n+1)+175 = 0
5*(3*n+1)+175 = 0
15*n+180 = 0
15*n+180 = 0
15*n+180 = 0 // - 180
15*n = -180 // : 15
n = -180/15
n = -12
n = -12
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