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u in (-oo:+oo)
(1/3)*(u+4) = 8 // - 8
(1/3)*(u+4)-8 = 0
1/3*(u+4)-8 = 0
1/3*(u+4)-8 = 0
1/3*u-20/3 = 0
1/3*u-20/3 = 0
1/3*u-20/3 = 0 // + 20/3
1/3*u = 20/3 // : 1/3
u = 20/3/1/3
u = 20
u = 20
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