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n in (-oo:+oo)
6*n-(2/7) = 40/7 // - 40/7
6*n-(2/7)-(40/7) = 0
6*n-2/7-40/7 = 0
6*n-6 = 0 // + 6
6*n = 6 // : 6
n = 6/6
n = 1
n = 1
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