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d in (-oo:+oo)
5 = (4/5)*d-3 // - (4/5)*d-3
3-((4/5)*d)+5 = 0
(-4/5)*d+3+5 = 0
8-4/5*d = 0 // - 8
-4/5*d = -8 // : -4/5
d = -8/(-4/5)
d = 10
d = 10
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