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n in (-oo:+oo)
(2/3)*n = 3/20 // - 3/20
(2/3)*n-(3/20) = 0
(2/3)*n-3/20 = 0
2/3*n-3/20 = 0 // + 3/20
2/3*n = 3/20 // : 2/3
n = 3/20/2/3
n = 9/40
n = 9/40
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