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n in (-oo:+oo)
(-2/5)*n-n-(1/3) = -71/45 // + -71/45
(-2/5)*n-n-(1/3)-(-71/45) = 0
(-2/5)*n-n-1/3+71/45 = 0
56/45-7/5*n = 0 // - 56/45
-7/5*n = -56/45 // : -7/5
n = -56/45/(-7/5)
n = 8/9
n = 8/9
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