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n in (-oo:+oo)
8*n-((-2*9)/7) = 6 // - 6
8*n-((-2*9)/7)-6 = 0
8*n+18/7-6 = 0
8*n-24/7 = 0 // + 24/7
8*n = 24/7 // : 8
n = 24/7/8
n = 3/7
n = 3/7
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