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n in (-oo:+oo)
5*n-((1/7)*n)-1/5 = -109/35 // + -109/35
5*n-((1/7)*n)-1/5-(-109/35) = 0
5*n+(-1/7)*n-1/5+109/35 = 0
34/7*n+102/35 = 0 // - 102/35
34/7*n = -102/35 // : 34/7
n = -102/35/34/7
n = -3/5
n = -3/5
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