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n in (-oo:+oo)
(2/3)*n-1 = 1/4 // - 1/4
(2/3)*n-(1/4)-1 = 0
(2/3)*n-1/4-1 = 0
2/3*n-5/4 = 0 // + 5/4
2/3*n = 5/4 // : 2/3
n = 5/4/2/3
n = 15/8
n = 15/8
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