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d in (-oo:+oo)
2/3 = (5/6)*d // - (5/6)*d
2/3-((5/6)*d) = 0
(-5/6)*d+2/3 = 0
2/3-5/6*d = 0 // - 2/3
-5/6*d = -2/3 // : -5/6
d = -2/3/(-5/6)
d = 4/5
d = 4/5
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