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n in (-oo:+oo)
-((4/5)*n)-9 = -9/5 // + -9/5
-((4/5)*n)-(-9/5)-9 = 0
(-4/5)*n+9/5-9 = 0
-4/5*n-36/5 = 0 // + 36/5
-4/5*n = 36/5 // : -4/5
n = 36/5/(-4/5)
n = -9
n = -9
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