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n in (-oo:+oo)
8*n-(-2/7) = 7 // - 7
8*n-(-2/7)-7 = 0
8*n+2/7-7 = 0
8*n-47/7 = 0 // + 47/7
8*n = 47/7 // : 8
n = 47/7/8
n = 47/56
n = 47/56
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