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d in (-oo:+oo)
6.25-(d/4) = 5 // - 5
6.25-(d/4)-5 = 0
1.25-1/4*d = 0 // - 1.25
-1/4*d = -1.25 // : -1/4
d = -1.25/(-1/4)
d = 5
d = 5
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