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n in (-oo:+oo)
-(9/2) = (5/4)*n+n // - (5/4)*n+n
-((5/4)*n)-n-(9/2) = 0
(-5/4)*n-n-9/2 = 0
-9/4*n-9/2 = 0 // + 9/2
-9/4*n = 9/2 // : -9/4
n = 9/2/(-9/4)
n = -2
n = -2
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