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d in (-oo:+oo)
(-1/5)*d-(4/9) = -92/45 // + -92/45
(-1/5)*d-(4/9)-(-92/45) = 0
(-1/5)*d-4/9+92/45 = 0
8/5-1/5*d = 0 // - 8/5
-1/5*d = -8/5 // : -1/5
d = -8/5/(-1/5)
d = 8
d = 8
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