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u in (-oo:+oo)
(-2/3)*u-(5/3) = (7/2)*u-1 // - (7/2)*u-1
(-2/3)*u-((7/2)*u)-(5/3)+1 = 0
(-2/3)*u+(-7/2)*u-5/3+1 = 0
-25/6*u-2/3 = 0 // + 2/3
-25/6*u = 2/3 // : -25/6
u = 2/3/(-25/6)
u = -4/25
u = -4/25
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