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n in (-oo:+oo)
7*n+2/5 = 37/5 // - 37/5
7*n+2/5-(37/5) = 0
7*n+2/5-37/5 = 0
7*n-7 = 0 // + 7
7*n = 7 // : 7
n = 7/7
n = 1
n = 1
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