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d in (-oo:+oo)
(-1/4)*d-5 = d-(55/9) // - d-(55/9)
(-1/4)*d-d+55/9-5 = 0
10/9-5/4*d = 0 // - 10/9
-5/4*d = -10/9 // : -5/4
d = -10/9/(-5/4)
d = 8/9
d = 8/9
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