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d in (-oo:+oo)
2*d+1/5 = (3*d)/8 // - (3*d)/8
2*d-((3*d)/8)+1/5 = 0
2*d+(-3/8)*d+1/5 = 0
13/8*d+1/5 = 0 // - 1/5
13/8*d = -1/5 // : 13/8
d = -1/5/13/8
d = -8/65
d = -8/65
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