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d in (-oo:+oo)
(3*d)/5-((7*d)/5) = 16 // - 16
(3*d)/5-((7*d)/5)-16 = 0
(3*d)/5+(-7/5)*d-16 = 0
-4/5*d-16 = 0 // + 16
-4/5*d = 16 // : -4/5
d = 16/(-4/5)
d = -20
d = -20
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