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t in (-oo:+oo)
t/5 = -2/3 // + -2/3
t/5-(-2/3) = 0
t/5+2/3 = 0
1/5*t+2/3 = 0 // - 2/3
1/5*t = -2/3 // : 1/5
t = -2/3/1/5
t = -10/3
t = -10/3
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