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d in (-oo:+oo)
-2.4 = d/4 // - d/4
-(d/4)-2.4 = 0
-1/4*d-2.4 = 0 // + 2.4
-1/4*d = 2.4 // : -1/4
d = 2.4/(-1/4)
d = -9.6
d = -9.6
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