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