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n in (-oo:+oo)
5/9-5*n = -40/9 // + -40/9
5/9-5*n-(-40/9) = 0
5/9-5*n+40/9 = 0
5-5*n = 0 // - 5
-5*n = -5 // : -5
n = -5/(-5)
n = 1
n = 1
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