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n in (-oo:+oo)
(n-2)/2 = 150 // - 150
(n-2)/2-150 = 0
(n-2)/2+(-150*2)/2 = 0
n-150*2-2 = 0
n-302 = 0
(n-302)/2 = 0
(n-302)/2 = 0 // * 2
n-302 = 0
n-302 = 0 // + 302
n = 302
n = 302
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