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d in (-oo:+oo)
2*d-(5*d)+5 = -28 // + 28
2*d-(5*d)+5+28 = 0
2*d-5*d+5+28 = 0
33-3*d = 0 // - 33
-3*d = -33 // : -3
d = -33/(-3)
d = 11
d = 11
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