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d in (-oo:+oo)
(1/5)*d = (1/2)*d+9 // - (1/2)*d+9
(1/5)*d-((1/2)*d)-9 = 0
(1/5)*d+(-1/2)*d-9 = 0
-3/10*d-9 = 0 // + 9
-3/10*d = 9 // : -3/10
d = 9/(-3/10)
d = -30
d = -30
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