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u in (-oo:+oo)
(-2/3)*u-((2/3)*u) = -4/3-(1/3) // + -4/3-(1/3)
(-2/3)*u-((2/3)*u)-(-4/3)+1/3 = 0
(-2/3)*u+(-2/3)*u+4/3+1/3 = 0
5/3-4/3*u = 0 // - 5/3
-4/3*u = -5/3 // : -4/3
u = -5/3/(-4/3)
u = 5/4
u = 5/4
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