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u in (-oo:+oo)
(2/3)*u-7 = 9-((2/3)*u) // - 9-((2/3)*u)
(2/3)*u+(2/3)*u-9-7 = 0
4/3*u-16 = 0 // + 16
4/3*u = 16 // : 4/3
u = 16/4/3
u = 12
u = 12
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