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d in (-oo:+oo)
1-4*d-d = -11/9 // + -11/9
1-4*d-d-(-11/9) = 0
11/9-4*d-d+1 = 0
20/9-5*d = 0 // - 20/9
-5*d = -20/9 // : -5
d = -20/9/(-5)
d = 4/9
d = 4/9
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