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d in (-oo:+oo)
(1/5)*d = (3/10)*d+16 // - (3/10)*d+16
(1/5)*d-((3/10)*d)-16 = 0
(1/5)*d+(-3/10)*d-16 = 0
-1/10*d-16 = 0 // + 16
-1/10*d = 16 // : -1/10
d = 16/(-1/10)
d = -160
d = -160
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