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d in (-oo:+oo)
9-((2/3)*d) = (6/7)*d+9 // - (6/7)*d+9
9-((2/3)*d)-((6/7)*d)-9 = 0
(-2/3)*d+(-6/7)*d-9+9 = 0
-32/21*d = 0 // : -32/21
d = 0
d = 0
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