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N in (-oo:+oo)
360 = (N/2)*(6*N+12) // - (N/2)*(6*N+12)
360-((N/2)*(6*N+12)) = 0
360-1*1/2*N*(6*N+12) = 0
360-1*1/2*N*(6*N+12) = 0
360-3*N^2-6*N = 0
360-3*N^2-6*N = 0
3*(120-N^2-2*N) = 0
120-N^2-2*N = 0
DELTA = (-2)^2-(-1*4*120)
DELTA = 484
DELTA > 0
N = (484^(1/2)+2)/(-1*2) or N = (2-484^(1/2))/(-1*2)
N = -12 or N = 10
3*(N+12)*(N-10) = 0
3*(N+12)*(N-10) = 0
( N+12 )
N+12 = 0 // - 12
N = -12
( N-10 )
N-10 = 0 // + 10
N = 10
N in { -12, 10 }
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