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d in (-oo:+oo)
1-d = (4/7)*d-(37/84) // - (4/7)*d-(37/84)
37/84-d-((4/7)*d)+1 = 0
(-4/7)*d-d+37/84+1 = 0
121/84-11/7*d = 0 // - 121/84
-11/7*d = -121/84 // : -11/7
d = -121/84/(-11/7)
d = 11/12
d = 11/12
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