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t in (-oo:+oo)
4*t+1/7 = t+t+4/14-(2/14) // - t+t+4/14-(2/14)
4*t-t-t+1/7-(4/14)+2/14 = 0
4*t-t-t+1/7-2/7+2/14 = 0
2*t = 0 // : 2
t = 0
t = 0
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