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T in (-oo:+oo)
18 = 1.08*(T/21) // - 1.08*(T/21)
18-(1.08*(T/21)) = 0
18-0.05142857*T = 0
18-0.05142857*T = 0 // - 18
-0.05142857*T = -18 // : -0.05142857
T = -18/(-0.05142857)
T = 350.00000972
T = 350.00000972
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