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d in (-oo:+oo)
(1/2)*d+7*d+5 = 35/4 // - 35/4
(1/2)*d+7*d-(35/4)+5 = 0
(1/2)*d+7*d-35/4+5 = 0
15/2*d-15/4 = 0 // + 15/4
15/2*d = 15/4 // : 15/2
d = 15/4/15/2
d = 1/2
d = 1/2
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