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d in (-oo:+oo)
-d-(1/4) = d+55/36 // - d+55/36
-d-d-(1/4)-(55/36) = 0
-d-d-1/4-55/36 = 0
-2*d-16/9 = 0 // + 16/9
-2*d = 16/9 // : -2
d = 16/9/(-2)
d = -8/9
d = -8/9
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