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d in (-oo:+oo)
(5/12)*d+5/9 = (7/9)*d+11/12 // - (7/9)*d+11/12
(5/12)*d-((7/9)*d)+5/9-(11/12) = 0
(5/12)*d+(-7/9)*d+5/9-11/12 = 0
-13/36*d-13/36 = 0 // + 13/36
-13/36*d = 13/36 // : -13/36
d = 13/36/(-13/36)
d = -1
d = -1
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