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n in (-oo:+oo)
14/4 = n/10 // - n/10
14/4-(n/10) = 0
7/2-1/10*n = 0 // - 7/2
-1/10*n = -7/2 // : -1/10
n = -7/2/(-1/10)
n = 35
n = 35
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