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d in (-oo:+oo)
(-4/9)*d = 5/9 // - 5/9
(-4/9)*d-(5/9) = 0
(-4/9)*d-5/9 = 0
-4/9*d-5/9 = 0 // + 5/9
-4/9*d = 5/9 // : -4/9
d = 5/9/(-4/9)
d = -5/4
d = -5/4
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