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t in (-oo:+oo)
2/3 = (-3/5)*t // - (-3/5)*t
2/3-((-3/5)*t) = 0
(3/5)*t+2/3 = 0
3/5*t+2/3 = 0 // - 2/3
3/5*t = -2/3 // : 3/5
t = -2/3/3/5
t = -10/9
t = -10/9
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