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u in (-oo:+oo)
2/3-((7/4)*u) = -6/5 // + -6/5
2/3-((7/4)*u)-(-6/5) = 0
(-7/4)*u+2/3+6/5 = 0
28/15-7/4*u = 0 // - 28/15
-7/4*u = -28/15 // : -7/4
u = -28/15/(-7/4)
u = 16/15
u = 16/15
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