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u in (-oo:+oo)
(1/2)*u-(7/5) = -6/7 // + -6/7
(1/2)*u-(7/5)-(-6/7) = 0
(1/2)*u-7/5+6/7 = 0
1/2*u-19/35 = 0 // + 19/35
1/2*u = 19/35 // : 1/2
u = 19/35/1/2
u = 38/35
u = 38/35
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