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u in (-oo:+oo)
(4/3)*u+(1/4)*u = 5/4+2/5 // - 5/4+2/5
(4/3)*u+(1/4)*u-(5/4)-(2/5) = 0
(4/3)*u+(1/4)*u-5/4-2/5 = 0
19/12*u-33/20 = 0 // + 33/20
19/12*u = 33/20 // : 19/12
u = 33/20/19/12
u = 99/95
u = 99/95
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