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n in (-oo:+oo)
25/4 = n/12 // - n/12
25/4-(n/12) = 0
25/4-1/12*n = 0 // - 25/4
-1/12*n = -25/4 // : -1/12
n = -25/4/(-1/12)
n = 75
n = 75
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