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u in (-oo:+oo)
-((2/3)*u)-2/5 = -3/4 // + -3/4
-((2/3)*u)-2/5-(-3/4) = 0
(-2/3)*u-2/5+3/4 = 0
7/20-2/3*u = 0 // - 7/20
-2/3*u = -7/20 // : -2/3
u = -7/20/(-2/3)
u = 21/40
u = 21/40
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