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n in (-oo:+oo)
n+4*n-(5/7) = 100/7 // - 100/7
n+4*n-(5/7)-(100/7) = 0
n+4*n-5/7-100/7 = 0
5*n-15 = 0 // + 15
5*n = 15 // : 5
n = 15/5
n = 3
n = 3
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