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n in (-oo:+oo)
(-1/2)*n-(5/9) = -34/45 // + -34/45
(-1/2)*n-(5/9)-(-34/45) = 0
(-1/2)*n-5/9+34/45 = 0
1/5-1/2*n = 0 // - 1/5
-1/2*n = -1/5 // : -1/2
n = -1/5/(-1/2)
n = 2/5
n = 2/5
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