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t in (-oo:+oo)
2-(5*t) = 5*t-8 // - 5*t-8
2-(5*t)-(5*t)+8 = 0
2-5*t-5*t+8 = 0
10-10*t = 0 // - 10
-10*t = -10 // : -10
t = -10/(-10)
t = 1
t = 1
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