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n in (-oo:+oo)
5*(6*n+5) = -215 // + 215
5*(6*n+5)+215 = 0
5*(6*n+5)+215 = 0
30*n+240 = 0
30*n+240 = 0
30*n+240 = 0 // - 240
30*n = -240 // : 30
n = -240/30
n = -8
n = -8
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