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u in (-oo:+oo)
-((7/3)*u)-1/4 = -5/2 // + -5/2
-((7/3)*u)-1/4-(-5/2) = 0
(-7/3)*u-1/4+5/2 = 0
9/4-7/3*u = 0 // - 9/4
-7/3*u = -9/4 // : -7/3
u = -9/4/(-7/3)
u = 27/28
u = 27/28
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