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d in (-oo:+oo)
(-2/9)*d = 4/9 // - 4/9
(-2/9)*d-(4/9) = 0
(-2/9)*d-4/9 = 0
-2/9*d-4/9 = 0 // + 4/9
-2/9*d = 4/9 // : -2/9
d = 4/9/(-2/9)
d = -2
d = -2
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