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u in (-oo:+oo)
(6/7)*u-(7/3) = -3/2 // + -3/2
(6/7)*u-(7/3)-(-3/2) = 0
(6/7)*u-7/3+3/2 = 0
6/7*u-5/6 = 0 // + 5/6
6/7*u = 5/6 // : 6/7
u = 5/6/6/7
u = 35/36
u = 35/36
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