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u in (-oo:+oo)
(2/3)*u-(3/2) = -(9/7) // + 9/7
(2/3)*u-(3/2)+9/7 = 0
(2/3)*u-3/2+9/7 = 0
2/3*u-3/14 = 0 // + 3/14
2/3*u = 3/14 // : 2/3
u = 3/14/2/3
u = 9/28
u = 9/28
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