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m1.c.t1=m2.c.t2
4.(ta-100)=12.(20-ta)
4ta-400=240-12ta
16 ta=640
ta=640/16=40' C
4. 4200 ( 100-ta ) = 12. 4200 (ta-60)
4(100-ta) = 12 (ta-60)
400-4ta = 12 ta-720
-12ta - 4ta = -720 - 400
-16 ta =-1120
16 ta = 1120
ta = 70' C