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d in (-oo:+oo)
-5*d = 20/9 // - 20/9
-5*d-(20/9) = 0
-5*d-20/9 = 0
-5*d-20/9 = 0 // + 20/9
-5*d = 20/9 // : -5
d = 20/9/(-5)
d = -4/9
d = -4/9
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