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u in (-oo:+oo)
(1/2)*(u-3) = 2*u-(3/2) // - 2*u-(3/2)
(1/2)*(u-3)-(2*u)+3/2 = 0
(1/2)*(u-3)-2*u+3/2 = 0
1/2*(u-3)-2*u+3/2 = 0
(1/2*2*(u-3))/2+(-2*2*u)/2+3/2 = 0
1/2*2*(u-3)-2*2*u+3 = 0
3-3*u-3 = 0
-3*u = 0
(-3*u)/2 = 0
(-3*u)/2 = 0 // * 2
-3*u = 0
-3*u = 0 // : -3
u = 0
u = 0
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