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n in (-oo:+oo)
2/3 = n/15 // - n/15
2/3-(n/15) = 0
2/3-1/15*n = 0 // - 2/3
-1/15*n = -2/3 // : -1/15
n = -2/3/(-1/15)
n = 10
n = 10
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