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t in (-oo:+oo)
6*t-(2/5) = 28/5 // - 28/5
6*t-(2/5)-(28/5) = 0
6*t-2/5-28/5 = 0
6*t-6 = 0 // + 6
6*t = 6 // : 6
t = 6/6
t = 1
t = 1
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