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d in (-oo:+oo)
(2/3)*(9*d-6) = 7*d+10 // - 7*d+10
(2/3)*(9*d-6)-(7*d)-10 = 0
(2/3)*(9*d-6)-7*d-10 = 0
2/3*(9*d-6)-7*d-10 = 0
2/3*(9*d-6)-7*d-10 = 0
-d-10-4 = 0
-d-14 = 0
-d-14 = 0
-d-14 = 0 // + 14
-d = 14 // * -1
d = -14
d = -14
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