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u in (-oo:+oo)
(9/2)*(u+3) = 1/2-u // - 1/2-u
(9/2)*(u+3)+u-(1/2) = 0
(9/2)*(u+3)+u-1/2 = 0
9/2*(u+3)+u-1/2 = 0
(2*9/2*(u+3))/2+(2*u)/2-1/2 = 0
2*9/2*(u+3)+2*u-1 = 0
11*u-1+27 = 0
11*u+26 = 0
(11*u+26)/2 = 0
(11*u+26)/2 = 0 // * 2
11*u+26 = 0
11*u+26 = 0 // - 26
11*u = -26 // : 11
u = -26/11
u = -26/11
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