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m₁c(T-T₁)=m₂c(t₂-t)- c możemy skrócić
m₁(t-t₁)=m₂(t₂-t)
m₁t-m₁t₁=m₂t₂-m₂t
m₁t+m₂t=m₁t₁+m₂t₂
t(m₁+m₂)=m₁t₁+m₂t₂
t=(m₁t₁+m₂t₂):(m₁+m₂)
t=(500+900):70
t=20⁰C