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