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t in (-oo:+oo)
3/5-(t/5) = 3 // - 3
3/5-(t/5)-3 = 0
-1/5*t-12/5 = 0 // + 12/5
-1/5*t = 12/5 // : -1/5
t = 12/5/(-1/5)
t = -12
t = -12
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