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n in (-oo:+oo)
n/7 = 10/35 // - 10/35
n/7-(10/35) = 0
n/7-2/7 = 0
1/7*n-2/7 = 0 // + 2/7
1/7*n = 2/7 // : 1/7
n = 2/7/1/7
n = 2
n = 2
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