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d in (-oo:+oo)
3*d-1/2 = 41/2-4*d // - 41/2-4*d
3*d-(-4*d)-1/2-(41/2) = 0
3*d+4*d-1/2-41/2 = 0
7*d-21 = 0 // + 21
7*d = 21 // : 7
d = 21/7
d = 3
d = 3
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