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n in (-oo:+oo)
51/3.1 = n/4 // - n/4
51/3.1-(n/4) = 0
16.4516129-1/4*n = 0 // - 16.4516129
-1/4*n = -16.4516129 // : -1/4
n = -16.4516129/(-1/4)
n = 65.8064516
n = 65.8064516
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