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n in (-oo:+oo)
6*(4*n+10) = -180 // + 180
6*(4*n+10)+180 = 0
6*(4*n+10)+180 = 0
24*n+240 = 0
24*n+240 = 0
24*n+240 = 0 // - 240
24*n = -240 // : 24
n = -240/24
n = -10
n = -10
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