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t in (-oo:+oo)
7*t+1/7 = t+t+5/14-(3/14) // - t+t+5/14-(3/14)
7*t-t-t+1/7-(5/14)+3/14 = 0
7*t-t-t+1/7-5/14+3/14 = 0
5*t = 0 // : 5
t = 0
t = 0
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