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n in (-oo:+oo)
4/6 = n/30 // - n/30
4/6-(n/30) = 0
2/3-1/30*n = 0 // - 2/3
-1/30*n = -2/3 // : -1/30
n = -2/3/(-1/30)
n = 20
n = 20
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