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n in (-oo:+oo)
7/10 = n/90 // - n/90
7/10-(n/90) = 0
7/10-1/90*n = 0 // - 7/10
-1/90*n = -7/10 // : -1/90
n = -7/10/(-1/90)
n = 63
n = 63
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