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