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n in (-oo:+oo)
(2/3)*n = 7/8 // - 7/8
(2/3)*n-(7/8) = 0
(2/3)*n-7/8 = 0
2/3*n-7/8 = 0 // + 7/8
2/3*n = 7/8 // : 2/3
n = 7/8/2/3
n = 21/16
n = 21/16
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