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