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T in (-oo:+oo)
T/8 = 3/21 // - 3/21
T/8-(3/21) = 0
T/8-1/7 = 0
1/8*T-1/7 = 0 // + 1/7
1/8*T = 1/7 // : 1/8
T = 1/7/1/8
T = 8/7
T = 8/7
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