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d in (-oo:+oo)
8-2*d-(2*d) = -36 // + 36
8-2*d-(2*d)+36 = 0
8-2*d-2*d+36 = 0
44-4*d = 0 // - 44
-4*d = -44 // : -4
d = -44/(-4)
d = 11
d = 11
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