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d in (-oo:+oo)
(1/8)*d+(3/8)*d-4-4 = 5 // - 5
(1/8)*d+(3/8)*d-5-4-4 = 0
1/2*d-13 = 0 // + 13
1/2*d = 13 // : 1/2
d = 13/1/2
d = 26
d = 26
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