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n in (-oo:+oo)
4*n-(1/7) = 5 // - 5
4*n-(1/7)-5 = 0
4*n-1/7-5 = 0
4*n-36/7 = 0 // + 36/7
4*n = 36/7 // : 4
n = 36/7/4
n = 9/7
n = 9/7
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