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d in (-oo:+oo)
(-2/4)*d-4-4 = 5 // - 5
(-2/4)*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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