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n in (-oo:+oo)
n/70 = 4/28 // - 4/28
n/70-(4/28) = 0
n/70-1/7 = 0
1/70*n-1/7 = 0 // + 1/7
1/70*n = 1/7 // : 1/70
n = 1/7/1/70
n = 10
n = 10
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