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n in (-oo:+oo)
(3/4)*n = 5/6 // - 5/6
(3/4)*n-(5/6) = 0
(3/4)*n-5/6 = 0
3/4*n-5/6 = 0 // + 5/6
3/4*n = 5/6 // : 3/4
n = 5/6/3/4
n = 10/9
n = 10/9
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