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t1 = 50
m2 = 3 kg
t2 = 30
suhu akhir = y
m1 (t1 - y) = m2 ( y - t2)
2 (50 - y) = 3(y - 30)
100 - 2y = 3y - 90
-2y - 3y = -90 - 100
-5y = - 190
y = 38°