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T in (-oo:+oo)
T/4 = 21/3 // - 21/3
T/4-(21/3) = 0
T/4-7 = 0
1/4*T-7 = 0 // + 7
1/4*T = 7 // : 1/4
T = 7/1/4
T = 28
T = 28
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