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u in (-oo:+oo)
(1/3)*u-(3/2) = -6/7 // + -6/7
(1/3)*u-(3/2)-(-6/7) = 0
(1/3)*u-3/2+6/7 = 0
1/3*u-9/14 = 0 // + 9/14
1/3*u = 9/14 // : 1/3
u = 9/14/1/3
u = 27/14
u = 27/14
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