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d in (-oo:+oo)
7*d+8/9 = 134/9 // - 134/9
7*d+8/9-(134/9) = 0
7*d+8/9-134/9 = 0
7*d-14 = 0 // + 14
7*d = 14 // : 7
d = 14/7
d = 2
d = 2
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