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n in (-oo:+oo)
-7/22 = n/22 // - n/22
-(n/22)-7/22 = 0
-1/22*n-7/22 = 0 // + 7/22
-1/22*n = 7/22 // : -1/22
n = 7/22/(-1/22)
n = -7
n = -7
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