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d in (-oo:+oo)
1/2-7*d = -d-47/2 // + -d-47/2
d-7*d+1/2-(-47/2) = 0
d-7*d+1/2+47/2 = 0
24-6*d = 0 // - 24
-6*d = -24 // : -6
d = -24/(-6)
d = 4
d = 4
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