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d in (-oo:+oo)
7/9-((2/5)*d) = 7/9 // - 7/9
7/9-((2/5)*d)-(7/9) = 0
(-2/5)*d+7/9-7/9 = 0
-2/5*d = 0 // : -2/5
d = 0
d = 0
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