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d in (-oo:+oo)
28 = 2*d+d-8 // - 2*d+d-8
8-(2*d)-d+28 = 0
8-2*d-d+28 = 0
36-3*d = 0 // - 36
-3*d = -36 // : -3
d = -36/(-3)
d = 12
d = 12
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