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n in (-oo:+oo)
3*n-(2/5) = 7/10 // - 7/10
3*n-(2/5)-(7/10) = 0
3*n-2/5-7/10 = 0
3*n-11/10 = 0 // + 11/10
3*n = 11/10 // : 3
n = 11/10/3
n = 11/30
n = 11/30
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