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d in (-oo:+oo)
-d/4 = 21/4 // - 21/4
-d/4-(21/4) = 0
-d/4-21/4 = 0
-1/4*d-21/4 = 0 // + 21/4
-1/4*d = 21/4 // : -1/4
d = 21/4/(-1/4)
d = -21
d = -21
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