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d in (-oo:+oo)
(4/5)*d-5*d+1 = -10/11 // + -10/11
(4/5)*d-5*d-(-10/11)+1 = 0
(4/5)*d-5*d+10/11+1 = 0
21/11-21/5*d = 0 // - 21/11
-21/5*d = -21/11 // : -21/5
d = -21/11/(-21/5)
d = 5/11
d = 5/11
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