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n in (-oo:+oo)
48 = (1/212)*n // - (1/212)*n
48-((1/212)*n) = 0
(-1/212)*n+48 = 0
48-1/212*n = 0 // - 48
-1/212*n = -48 // : -1/212
n = -48/(-1/212)
n = 10176
n = 10176
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