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T in (-oo:+oo)
T/42 = 1.5/3 // - 1.5/3
T/42-(1.5/3) = 0
T/42-0.5 = 0
1/42*T-0.5 = 0 // + 0.5
1/42*T = 0.5 // : 1/42
T = 0.5/1/42
T = 21.00000336
T = 21.00000336
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