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t in (-oo:+oo)
5*t+2/5 = -248/5 // + -248/5
5*t+2/5-(-248/5) = 0
5*t+2/5+248/5 = 0
5*t+50 = 0 // - 50
5*t = -50 // : 5
t = -50/5
t = -10
t = -10
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