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d in (-oo:+oo)
36 = 7*d-3*d-8 // - 7*d-3*d-8
8-(-3*d)-(7*d)+36 = 0
3*d-7*d+8+36 = 0
44-4*d = 0 // - 44
-4*d = -44 // : -4
d = -44/(-4)
d = 11
d = 11
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