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t in (-oo:+oo)
5*t-3 = 7*t-(8/3) // - 7*t-(8/3)
5*t-(7*t)+8/3-3 = 0
5*t-7*t+8/3-3 = 0
-2*t-1/3 = 0 // + 1/3
-2*t = 1/3 // : -2
t = 1/3/(-2)
t = -1/6
t = -1/6
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