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d in (-oo:+oo)
1/2-d = 11/10-4*d // - 11/10-4*d
1/2-d-(-4*d)-(11/10) = 0
4*d-d+1/2-11/10 = 0
3*d-3/5 = 0 // + 3/5
3*d = 3/5 // : 3
d = 3/5/3
d = 1/5
d = 1/5
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