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u in (-oo:+oo)
(4/3)*u-(1/3) = (3/4)*u-1 // - (3/4)*u-1
(4/3)*u-((3/4)*u)-(1/3)+1 = 0
(4/3)*u+(-3/4)*u-1/3+1 = 0
7/12*u+2/3 = 0 // - 2/3
7/12*u = -2/3 // : 7/12
u = -2/3/7/12
u = -8/7
u = -8/7
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