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u in (-oo:+oo)
9-((4/5)*(u-3)) = 0
(-4/5)*(u-3)+9 = 0
9-4/5*(u-3) = 0
9-4/5*(u-3) = 0
57/5-4/5*u = 0
57/5-4/5*u = 0
57/5-4/5*u = 0 // - 57/5
-4/5*u = -57/5 // : -4/5
u = -57/5/(-4/5)
u = 57/4
u = 57/4
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