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t in (-oo:+oo)
7*t-(5*t)+8 = 28/3 // - 28/3
7*t-(5*t)-(28/3)+8 = 0
7*t-5*t-28/3+8 = 0
2*t-4/3 = 0 // + 4/3
2*t = 4/3 // : 2
t = 4/3/2
t = 2/3
t = 2/3
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