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d in (-oo:+oo)
(13*d)/16-(3/4) = 7/8 // - 7/8
(13*d)/16-(3/4)-(7/8) = 0
(13*d)/16-3/4-7/8 = 0
13/16*d-13/8 = 0 // + 13/8
13/16*d = 13/8 // : 13/16
d = 13/8/13/16
d = 2
d = 2
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