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u in (-oo:+oo)
u-((4/3)*u)+1/4 = (-1/9)*(u-(3/2)) // - (-1/9)*(u-(3/2))
u-((-1/9)*(u-(3/2)))-((4/3)*u)+1/4 = 0
(1/9)*(u-3/2)+u+(-4/3)*u+1/4 = 0
1/9*(u-3/2)+u+(-4*u)/3+1/4 = 0
(1/9*3*4*(u-3/2))/(3*4)+(3*4*u)/(3*4)+(-4*4*u)/(3*4)+(1*3)/(3*4) = 0
1/9*3*4*(u-3/2)+3*4*u-4*4*u+1*3 = 0
40/3*u-16*u-2+3 = 0
3-8/3*u-2 = 0
1-8/3*u = 0
(1-8/3*u)/(3*4) = 0
(1-8/3*u)/(3*4) = 0 // * 3*4
1-8/3*u = 0
1-8/3*u = 0 // - 1
-8/3*u = -1 // : -8/3
u = -1/(-8/3)
u = 3/8
u = 3/8
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