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