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T in (-oo:+oo)
T/30 = 7/10 // - 7/10
T/30-(7/10) = 0
T/30-7/10 = 0
1/30*T-7/10 = 0 // + 7/10
1/30*T = 7/10 // : 1/30
T = 7/10/1/30
T = 21
T = 21
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