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t in (-oo:+oo)
(2/3)*(t+6) = 1/3-t // - 1/3-t
(2/3)*(t+6)+t-(1/3) = 0
(2/3)*(t+6)+t-1/3 = 0
2/3*(t+6)+t-1/3 = 0
(2/3*3*(t+6))/3+(3*t)/3-1/3 = 0
2/3*3*(t+6)+3*t-1 = 0
5*t-1+12 = 0
5*t+11 = 0
(5*t+11)/3 = 0
(5*t+11)/3 = 0 // * 3
5*t+11 = 0
5*t+11 = 0 // - 11
5*t = -11 // : 5
t = -11/5
t = -11/5
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