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d in (-oo:+oo)
-(2*d)-4 = 16 // - 16
-(2*d)-16-4 = 0
-2*d-16-4 = 0
-2*d-20 = 0 // + 20
-2*d = 20 // : -2
d = 20/(-2)
d = -10
d = -10
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