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d in (-oo:+oo)
(3/7)*d = 3/8 // - 3/8
(3/7)*d-(3/8) = 0
(3/7)*d-3/8 = 0
3/7*d-3/8 = 0 // + 3/8
3/7*d = 3/8 // : 3/7
d = 3/8/3/7
d = 7/8
d = 7/8
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