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T in (-oo:+oo)
T/3 = 18/6 // - 18/6
T/3-(18/6) = 0
T/3-3 = 0
1/3*T-3 = 0 // + 3
1/3*T = 3 // : 1/3
T = 3/1/3
T = 9
T = 9
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