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d in (-oo:+oo)
7-d-(3*d) = 11 // - 11
7-d-(3*d)-11 = 0
7-d-3*d-11 = 0
-4*d-4 = 0 // + 4
-4*d = 4 // : -4
d = 4/(-4)
d = -1
d = -1
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