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u in (-oo:+oo)
9-((4/5)*(u-3)) = 1 // - 1
9-((4/5)*(u-3))-1 = 0
(-4/5)*(u-3)-1+9 = 0
9-4/5*(u-3)-1 = 0
9-4/5*(u-3)-1 = 0
7/5-4/5*u+9 = 0
52/5-4/5*u = 0
52/5-4/5*u = 0
52/5-4/5*u = 0 // - 52/5
-4/5*u = -52/5 // : -4/5
u = -52/5/(-4/5)
u = 13
u = 13
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