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n in (-oo:+oo)
7/90 = n/15 // - n/15
7/90-(n/15) = 0
7/90-1/15*n = 0 // - 7/90
-1/15*n = -7/90 // : -1/15
n = -7/90/(-1/15)
n = 7/6
n = 7/6
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