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