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u in (-oo:+oo)
(1/8)*(u+12) = 2*u // - 2*u
(1/8)*(u+12)-(2*u) = 0
(1/8)*(u+12)-2*u = 0
1/8*(u+12)-2*u = 0
1/8*(u+12)-2*u = 0
3/2-15/8*u = 0
3/2-15/8*u = 0
3/2-15/8*u = 0 // - 3/2
-15/8*u = -3/2 // : -15/8
u = -3/2/(-15/8)
u = 4/5
u = 4/5
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