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d in (-oo:+oo)
(4*d)/5+3*d = 9/8 // - 9/8
(4*d)/5+3*d-(9/8) = 0
(4*d)/5+3*d-9/8 = 0
19/5*d-9/8 = 0 // + 9/8
19/5*d = 9/8 // : 19/5
d = 9/8/19/5
d = 45/152
d = 45/152
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