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n in (-oo:+oo)
3/8 = n/30 // - n/30
3/8-(n/30) = 0
3/8-1/30*n = 0 // - 3/8
-1/30*n = -3/8 // : -1/30
n = -3/8/(-1/30)
n = 45/4
n = 45/4
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