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n in (-oo:+oo)
7*n+3/5 = 53/30 // - 53/30
7*n+3/5-(53/30) = 0
7*n+3/5-53/30 = 0
7*n-7/6 = 0 // + 7/6
7*n = 7/6 // : 7
n = 7/6/7
n = 1/6
n = 1/6
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