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d in (-oo:+oo)
36 = (4/9)*d // - (4/9)*d
36-((4/9)*d) = 0
(-4/9)*d+36 = 0
36-4/9*d = 0 // - 36
-4/9*d = -36 // : -4/9
d = -36/(-4/9)
d = 81
d = 81
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