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u in (-oo:+oo)
(2/3)*(u+4) = 1/3-u // - 1/3-u
(2/3)*(u+4)+u-(1/3) = 0
(2/3)*(u+4)+u-1/3 = 0
2/3*(u+4)+u-1/3 = 0
(2/3*3*(u+4))/3+(3*u)/3-1/3 = 0
2/3*3*(u+4)+3*u-1 = 0
5*u-1+8 = 0
5*u+7 = 0
(5*u+7)/3 = 0
(5*u+7)/3 = 0 // * 3
5*u+7 = 0
5*u+7 = 0 // - 7
5*u = -7 // : 5
u = -7/5
u = -7/5
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