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d in (-oo:+oo)
7-3*d = 65/11 // - 65/11
7-3*d-(65/11) = 0
7-3*d-65/11 = 0
12/11-3*d = 0 // - 12/11
-3*d = -12/11 // : -3
d = -12/11/(-3)
d = 4/11
d = 4/11
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