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n in (-oo:+oo)
-8 = (4/9)*n // - (4/9)*n
-((4/9)*n)-8 = 0
(-4/9)*n-8 = 0
-4/9*n-8 = 0 // + 8
-4/9*n = 8 // : -4/9
n = 8/(-4/9)
n = -18
n = -18
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