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d in (-oo:+oo)
(1/2)*d+6 = 44/7 // - 44/7
(1/2)*d-(44/7)+6 = 0
(1/2)*d-44/7+6 = 0
1/2*d-2/7 = 0 // + 2/7
1/2*d = 2/7 // : 1/2
d = 2/7/1/2
d = 4/7
d = 4/7
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