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m₁(t₃-t₁)=m₂(t₂-t₃)
m₁t₃-m₁t₁=m₂t₂-m₂t₃
m₁t₃+m₂t₃=m₂t₂+-m₁t₁
t₃(m₁+m₂)=m₂t₂+-m₁t₁
t₃=[m₂t₂+-m₁t₁]:(m₁+m₂)
t₃=[20kg×80⁰C+50kg×10⁰C]:70kg
t₃=2100⁰C:70
t₃=30⁰C