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u in (-oo:+oo)
(2/3)*u-(3/4) = -3/5 // + -3/5
(2/3)*u-(3/4)-(-3/5) = 0
(2/3)*u-3/4+3/5 = 0
2/3*u-3/20 = 0 // + 3/20
2/3*u = 3/20 // : 2/3
u = 3/20/2/3
u = 9/40
u = 9/40
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