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