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20% = ( 1 - T2/640) x 100%
0,2 = 1 - T2/640
-0,8 = - T2/640 ==> T2 = 640 x 0,8 = 512.
36% = (1 - 512/T1) x 100%
0,36 = 1 - 512/T1
-0,64 = -512/T1
T1 = 800 K