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u in (-oo:+oo)
(2/3)*u-7 = 9-(2/3) // - 9-(2/3)
(2/3)*u+2/3-9-7 = 0
2/3*u-46/3 = 0 // + 46/3
2/3*u = 46/3 // : 2/3
u = 46/3/2/3
u = 23
u = 23
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