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d in (-oo:+oo)
(1*d)/2-(3/4) = (3*d)/5 // - (3*d)/5
(1*d)/2-((3*d)/5)-(3/4) = 0
d/2+(-3/5)*d-3/4 = 0
-1/10*d-3/4 = 0 // + 3/4
-1/10*d = 3/4 // : -1/10
d = 3/4/(-1/10)
d = -15/2
d = -15/2
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