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d in (-oo:+oo)
(1/5)*d+(1/8)*d = 2 // - 2
(1/5)*d+(1/8)*d-2 = 0
13/40*d-2 = 0 // + 2
13/40*d = 2 // : 13/40
d = 2/13/40
d = 80/13
d = 80/13
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