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n in (-oo:+oo)
7/4 = n/28 // - n/28
7/4-(n/28) = 0
7/4-1/28*n = 0 // - 7/4
-1/28*n = -7/4 // : -1/28
n = -7/4/(-1/28)
n = 49
n = 49
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