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0,3 x 4200 x (Tc-30) = 0,2 x 4200 x (90-Tc)
1290 (Tc-30) = 2100 (90-Tc)
1290Tc - 38700 = 189000 - 2100Tc
1290Tc + 2100Tc = 189000 + 38700
3390Tc = 227700
Tc = 227700/3390
Tc = 67,17