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d in (-oo:+oo)
14*d = 51/2-8 // - 51/2-8
14*d-(51/2)+8 = 0
14*d-51/2+8 = 0
14*d-35/2 = 0 // + 35/2
14*d = 35/2 // : 14
d = 35/2/14
d = 5/4
d = 5/4
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