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n in (-oo:+oo)
3*n-(2/4) = 7/10 // - 7/10
3*n-(2/4)-(7/10) = 0
3*n-1/2-7/10 = 0
3*n-6/5 = 0 // + 6/5
3*n = 6/5 // : 3
n = 6/5/3
n = 2/5
n = 2/5
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