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n in (-oo:+oo)
2*n-(4/5) = 3*n+3/10 // - 3*n+3/10
2*n-(3*n)-(4/5)-(3/10) = 0
2*n-3*n-4/5-3/10 = 0
-n-11/10 = 0 // + 11/10
-n = 11/10 // * -1
n = -11/10
n = -11/10
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