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