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d in (-oo:+oo)
(1/5)*d+19/20 = (7/20)*d+4/5 // - (7/20)*d+4/5
(1/5)*d-((7/20)*d)+19/20-(4/5) = 0
(1/5)*d+(-7/20)*d+19/20-4/5 = 0
3/20-3/20*d = 0 // - 3/20
-3/20*d = -3/20 // : -3/20
d = -3/20/(-3/20)
d = 1
d = 1
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