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d in (-oo:+oo)
3*d+2/3 = 7*d-(82/3) // - 7*d-(82/3)
3*d-(7*d)+2/3+82/3 = 0
3*d-7*d+2/3+82/3 = 0
28-4*d = 0 // - 28
-4*d = -28 // : -4
d = -28/(-4)
d = 7
d = 7
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