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(180*(N-2))/n = 150 // - 150
(180*(N-2))/n-150 = 0
(180*(N-2))/n+(-150*n)/n = 0
180*(N-2)-150*n = 0
180*N-150*n-360 = 0
(180*N-150*n-360)/n = 0
(180*N-150*n-360)/n = 0 // * n
180*N-150*n-360 = 0
x belongs to the empty set
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