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d in (-oo:+oo)
(3/5)*(d/8+1/4) = 9/16 // - 9/16
(3/5)*(d/8+1/4)-(9/16) = 0
(3/5)*(d/8+1/4)-9/16 = 0
3/5*(1/8*d+1/4)-9/16 = 0
(3/5*16*(1/8*d+1/4))/16-9/16 = 0
3/5*16*(1/8*d+1/4)-9 = 0
6/5*d-33/5 = 0
(6/5*d-33/5)/16 = 0
(6/5*d-33/5)/16 = 0 // * 16
6/5*d-33/5 = 0
6/5*d-33/5 = 0 // + 33/5
6/5*d = 33/5 // : 6/5
d = 33/5/6/5
d = 11/2
d = 11/2
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