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n in (-oo:+oo)
200/1 = n/3 // - n/3
200/1-(n/3) = 0
200-(n/3) = 0
200-1/3*n = 0 // - 200
-1/3*n = -200 // : -1/3
n = -200/(-1/3)
n = 600
n = 600
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