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a)c₁m₁t₁-c₁m₁t=c₂m₂(t-t₂)
t₁=c₂m₂(t-t₂):c₁m₁
b)c₁m₁(t₁-t)=c₂m₂t-c₂m₂t₂
c₂m₂t₂=c₂m₂t-c₁m₁(t₁-t)
t₂=[c₂m₂t-c₁m₁(t₁-t)]:c₂m₂
c)c₁m₁t₁-c₁m₁t=c₂m₂t-c₂m₂t₂
c₁m₁t₁+c₂m₂t₂=c₂m₂t+c₁m₁t
c₂m₂t+c₁m₁t=c₁m₁t₁+c₂m₂t₂
t(c₂m₂+c₁m₁)=c₁m₁t₁+c₂m₂t₂
t=[c₁m₁t₁+c₂m₂t₂]:(c₂m₂+c₁m₁)