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d in (-oo:+oo)
(2/3)*d+d+7/9 = 187/9 // - 187/9
(2/3)*d+d+7/9-(187/9) = 0
(2/3)*d+d+7/9-187/9 = 0
5/3*d-20 = 0 // + 20
5/3*d = 20 // : 5/3
d = 20/5/3
d = 12
d = 12
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