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