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n in (-oo:+oo)
8*n-(-2/7) = 6 // - 6
8*n-(-2/7)-6 = 0
8*n+2/7-6 = 0
8*n-40/7 = 0 // + 40/7
8*n = 40/7 // : 8
n = 40/7/8
n = 5/7
n = 5/7
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