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t in (-oo:+oo)
(-2/5)*t+(4/5)*t = 4/3-(2/5) // - 4/3-(2/5)
(-2/5)*t+(4/5)*t-(4/3)+2/5 = 0
(-2/5)*t+(4/5)*t-4/3+2/5 = 0
2/5*t-14/15 = 0 // + 14/15
2/5*t = 14/15 // : 2/5
t = 14/15/2/5
t = 7/3
t = 7/3
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