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n in (-oo:+oo)
n/(-7) = 4/7 // - 4/7
n/(-7)-(4/7) = 0
n/(-7)-4/7 = 0
-1/7*n-4/7 = 0 // + 4/7
-1/7*n = 4/7 // : -1/7
n = 4/7/(-1/7)
n = -4
n = -4
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