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n in (-oo:+oo)
(3/4)*n = 7/8 // - 7/8
(3/4)*n-(7/8) = 0
(3/4)*n-7/8 = 0
3/4*n-7/8 = 0 // + 7/8
3/4*n = 7/8 // : 3/4
n = 7/8/3/4
n = 7/6
n = 7/6
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